High Reliability Surveillance and/or Identification Tag/Devices and Methods of Making and Using the Same

ABSTRACT

The present invention relates to methods of making capacitors for use in surveillance/identification tags or devices, and methods of using such surveillance/identification devices. The capacitors manufactured according to the methods of the present invention and used in the surveillance/identification devices described herein comprise printed conductive and dielectric layers. The methods and devices of the present invention improve the manufacturing tolerances associated with conventional metal-plastic-metal capacitor, as well as the deactivation reliability of the capacitor used in a surveillance/identification tag or device.

RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.60/998,553, filed Oct. 10, 2007 (Attorney Docket No. IDR1411), which isincorporated herein by reference in its entirety, and U.S. ProvisionalApplication No. 60/998,554, filed Oct. 10, 2007 (Attorney Docket No.IDR1461). Furthermore, this application may be related to U.S. Pat. No.7,286,053 and co-pending U.S. patent application Ser. No. 11/243,460(Attorney Docket No. IDR0272), filed Oct. 3, 2005, the relevant portionsof which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention generally relates to the field of surveillanceand/or identification tags and devices. More specifically, embodimentsof the present invention pertain to EAS, RF and/or RFID tags/devices,structures and methods for their manufacturing and/or production, andmethods of using such tags and/or devices.

SUMMARY OF THE INVENTION

Embodiments of the present invention relate tosurveillance/identification tags and devices, the structures comprisingsuch devices, and methods of manufacturing and using the same. Morespecifically, embodiments of the present invention pertain to EAS, RFand/or RFID devices, structures thereof, and methods for theirmanufacture and use.

A first aspect of the present invention concerns methods of makingcapacitors and/or surveillance/identification devices. In one generalmethod, a capacitor can be made by forming a dielectric layer on anelectrically conductive substrate, and then printing a (semi)conductivelayer on at least a portion of the printed dielectric layer. Thedielectric layer is then etched using the (semi)conductive layer as amask to form a capacitor dielectric on the electrically conductivesubstrate. A second dielectric layer is then formed in a pattern on theconductive substrate and/or the (semi)conductor layer (e.g., the topcapacitor electrode). An electrically conducting “feature” is thenformed on the second dielectric layer. A first portion of the feature isin contact with the (semi)conductive layer (e.g., top capacitorelectrode) and a second portion of the conducting feature is in contactwith the conductive substrate. A bottom capacitor electrode is thenformed from the conductive substrate. In various embodiments, aninductor and/or antenna may be formed from the conductive substrate tomanufacture a surveillance/identification device.

In a second general embodiment, a capacitor can be made by printing afirst (semi)conductive layer, including a bottom capacitor electrode ona substrate, forming a first dielectric layer in a pattern on the first(semi)conductive layer, and printing a top/upper capacitorelectrode/plate on the first dielectric layer. A second dielectric layeris formed on the substrate. The second dielectric layer has a firstcontact hole therein exposing the first (semi)conductive layer, and asecond contact hole exposing the top/upper capacitor electrode. Asurveillance/identification device may be made using this capacitor bycoupling and/or connecting an antenna and/or inductor to the first(semi)conductive layer and the top capacitor electrode.

A second aspect of the present invention concerns surveillance and/oridentification devices, such as EAS, RF, and/or RFID devices or tags.According to one general embodiment, the surveillance and/oridentification device generally comprises (a) a unitary conductivestructure comprising a bottom capacitor electrode and an inductor, (b) afirst dielectric layer on the bottom capacitor electrode and inductor,(c) a top capacitor electrode having a dome-shaped profile on the firstdielectric layer, (d) a second dielectric layer on the top capacitorelectrode, and the conductive structure, and (e) an electricallyconducting feature on the second dielectric, having one portioncontacting the top capacitor electrode and a second portion contactingthe conductive structure.

According to a second general embodiment, a surveillance and/oridentification device comprises (a) a bottom capacitor electrode havinga dome-shaped profile on a substrate, (b) a first dielectric layer onthe bottom capacitor electrode, (c) top capacitor electrode having adome-shaped profile on the first dielectric layer, (d) a seconddielectric layer on the substrate having first and second contact holestherein to expose the bottom capacitor electrode and the top capacitorelectrode, and (e) and antenna and/or inductor having a first endcoupled to the bottom capacitor electrode and a second end coupled tothe top capacitor electrode.

A third aspect of the present invention concerns a method of detectingitems with the surveillance and/or identification devices of the presentinvention. In general a surveillance/identification device can bedetected by causing or inducing a current sufficient for the device toradiate, reflect, or backscatter detectable electromagnetic radiationand detecting the detectable electromagnetic radiation. Optionally, adevice that is detected can be selectively deactivated, or in thealternative, a detected device may be instructed to perform an action.

The present invention solves known problems associated with conventionalsurveillance and/or identification devices including (1) unreliablebreakdown of the capacitor dielectric due to large manufacturingtolerances associated with the thickness and quality of the capacitordielectric used in conventional surveillance/identification devices(e.g., plastic dielectric), and (2) recovery of the device due to areformation of “healing” of the capacitor dielectric layer after it hasbroken down in the deactivation process. Using a capacitor formed with aprinted metal-oxide-semiconductor device and/or using thin filmmaterials as described herein, ensures improved manufacturingtolerances, and also ensures that the healing problems associated withconventional capacitors are eliminated or dramatically reduced. Theseand other advantages of the present invention will become readilyapparent from the detailed description of preferred embodiments below.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B show cross-sectional and top views, respectively, of aconductive substrate having a dielectric layer and (semi)conductivelayer printed thereon.

FIG. 2 shows a cross-sectional view of the structure of FIGS. 1A and 1Bwith the dielectric layer etched using the (semi)conductive layer as amask.

FIGS. 3A and 3B show cross-sectional and top views, respectively, of thestructure of FIG. 2 with a second dielectric layer on the(semi)conductive layer.

FIGS. 4A and 4B show cross-sectional and top views, respectively, of thestructure of FIGS. 3A-3B with an electrically conducting feature on thesecond dielectric layer.

FIG. 5 shows a cross-sectional view of the structure of FIGS. 4A-4B witha passivation layer formed thereon.

FIG. 6A shows a cross-sectional view of the structure of FIG. 5 with abottom electrode and an inductor formed from the conductive substrate.

FIG. 6B shows a bottom up view of the structure of FIG. 6A.

FIGS. 7A and 7B show cross-sectional and top views, respectively, of asubstrate and a first (semi)conductive layer formed thereon, accordingto another exemplary embodiment of the present invention.

FIG. 8 shows a cross-sectional view of the structure of FIGS. 7A-7B witha first dielectric layer printed thereon.

FIGS. 9A and 9B show cross-sectional and top views, respectively, of thestructure of FIG. 8 with an upper capacitor plate printed on the firstdielectric layer.

FIG. 10 shows a cross-sectional view of the structure of FIGS. 9A and 9Bwith a second dielectric layer formed on the upper capacitor plate, thesecond dielectric layer having first and second contact holes formedtherein.

FIG. 11 shows an exemplary method of forming a surveillance and/oridentification device according to the present invention by attaching aninductor/antenna to the structure of FIG. 10.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Reference will now be made in detail to the preferred embodiments of theinvention, examples of which are illustrated in the accompanyingdrawings. While the invention will be described in conjunction with thepreferred embodiments, it will be understood that they are not intendedto limit the invention to these embodiments. On the contrary, theinvention is intended to cover alternatives, modifications andequivalents, which may be included within the spirit and scope of theinvention as defined by the appended claims. Furthermore, in thefollowing detailed description of the present invention, numerousspecific details are set forth in order to provide a thoroughunderstanding of the present invention. However, it will be readilyapparent to one skilled in the art that the present invention may bepracticed without these specific details. In other instances, well-knownmethods, procedures, components, and circuits have not been described indetail so as not to unnecessarily obscure aspects of the presentinvention. In addition, it should be understood that the possiblepermutations and combinations described herein are not meant to limitthe invention. Specifically, variations that are not inconsistent may bemixed and matched as desired.

For the sake of convenience and simplicity, the terms “coupled to,”“connected to,” and “in communication with” mean direct or indirectcoupling, connection or communication unless the context indicatesotherwise. These terms are generally used interchangeably herein, butare generally given their art-recognized meanings. Also, for convenienceand simplicity, the terms “surveillance,” “EAS,” “wireless,” “RF,”“RFID,” and “identification” may be used interchangeably with respect tointended uses and/or functions of a device and/or tag, and the term “EAStag” or “EAS device” may be used herein to refer to any EAS and/orsurveillance tag and/or device. In addition, the terms “item,” “object”and “article” are used interchangeably, and wherever one such term isused, it also encompasses the other terms. Furthermore, the terms“capacitor electrode” and “capacitor plate” may be used interchangeably,and also the terms “shape,” “feature,” “line,” and “pattern” may be usedinterchangeably. The term “(semi)conductor,” “(semi)conductive” andgrammatical equivalents thereof refer to materials, precursors, layers,features or other species or structures that are conductive and/orsemiconductive.

In the present application, the term “deposit” (and grammaticalvariations thereof) is intended to encompass all forms of deposition,including blanket deposition (e.g., CVD and PVD), (spin)coating, andprinting. In various embodiments of the method of printing ametal-containing ink on a substrate, printing may comprise inkjetting,gravure printing, offset printing, flexographic printing, spray-coating,slit coating, extrusion coating, meniscus coating, microspotting and/orpen-coating the metal formulation onto the substrate. Also, forconvenience and simplicity, the terms “part,” “portion,” and “region”may be used interchangeably but these terms are also generally giventheir art-recognized meanings. Also, unless indicated otherwise from thecontext of its use herein, the terms “known,” “fixed,” “given,”“certain” and “predetermined” generally refer to a value, quantity,parameter, constraint, condition, state, process, procedure, method,practice, or combination thereof that is, in theory, variable, but istypically set in advance and not varied thereafter when in use. Inaddition, the term “doped” refers to a material that is doped with anysubstantially controllable dose of any dopant (e.g., lightly doped,heavily doped, or doped at any doping level in between).

In the present disclosure, the phrase “consisting essentially of a GroupIVA element” does not exclude intentionally added dopants, which maygive the Group IVA element certain desired (and potentially quitedifferent) electrical properties. The term “(poly)silane” refers tocompounds or mixtures of compounds that consist essentially of (1)silicon and/or germanium and (2) hydrogen, and that predominantlycontain species having at least 15 silicon and/or germanium atoms. Suchspecies may contain one or more cyclic rings. The term “(cyclo)silane”refers to compounds or mixtures of compounds that consist essentially of(1) silicon and/or germanium and (2) hydrogen, and that may contain oneor more cyclic rings and less than 15 silicon and/or germanium atoms. Ina preferred embodiment the silane has a formula Si_(x)H_(y), where x isfrom 3 to about 200, and y is from x to (2x+2), where x may be derivedfrom an average number molecular weight of the silane. The term“hetero(cyclo)silane” refers to compounds or mixtures of compounds thatconsist essentially of (1) silicon and/or germanium, (2) hydrogen, and(3) dopant atoms such as B, P, As or Sb that may be substituted by aconventional hydrocarbon, silane or germane substituent and that maycontain one or more cyclic rings. Also, a “major surface” of a structureor feature is a surface defined at least in part by the largest axis ofthe structure or feature (e.g., if the structure is round and has aradius greater than its thickness, the radial surface[s] is/are themajor surface of the structure).

One embodiment of the present invention concerns a method of making acapacitor and/or surveillance/identification device comprising the stepsof (a) forming a first dielectric layer on a conductive substrate, (b)printing a (semi)conductive layer on at least a portion of the firstdielectric layer, (c) etching the first dielectric layer using the(semi)conductive layer as a mask, (d) forming a second dielectric layerin a pattern on the conductive substrate and/or the (semi)conductivelayer, (e) forming an electrically conducting feature on the seconddielectric layer, one portion of the electrically conducting featurecontacting the (semi)conductive layer and a second portion of theconducting feature contacting the conductive substrate, (f) forming abottom capacitor electrode from the conductive substrate, and if makinga surveillance/identification device (g) forming an inductor from theconductive substrate.

A second embodiment of the present invention concerns a second method ofmaking a capacitor and/or surveillance/identification device comprisingthe steps of (a) printing a first (semi)conductive layer, including abottom capacitor electrode on a substrate, (b) forming a firstdielectric layer in a pattern on the first (semi)conductive layer, (c)printing a top capacitor electrode on the first dielectric layer, (d)forming a second dielectric layer on the substrate, the seconddielectric layer having a first contact hole therein exposing the first(semi)conductive layer and a second contact hole exposing the topcapacitor electrode, and if making a surveillance/identification device(e) coupling and/or connecting an antenna and/or inductor to the first(semi)conductive layer and the upper capacitor plate.

In a further embodiment, the present invention concerns a surveillanceand/or identification device comprising (a) a unitary conductivestructure comprising a bottom capacitor electrode and an inductor, (b) afirst dielectric layer on the bottom capacitor electrode and inductor,(c) a top capacitor electrode having a dome-shaped profile on the firstdielectric layer, (d) a second dielectric layer on the top capacitorelectrode and the conductive structure, and (e) an electricallyconducting feature on the second dielectric, having one portioncontacting the top capacitor electrode and a second portion contactingthe conductive structure.

In an alternative embodiment, a surveillance and/or identificationdevice may comprise (a) a bottom capacitor electrode having adome-shaped profile on a substrate, (b) a first dielectric layer on thebottom capacitor electrode, (c) top capacitor electrode having adome-shaped profile on the first dielectric layer, (d) a seconddielectric layer on the substrate having first and second contact holestherein to expose the bottom capacitor electrode and the top capacitorelectrode, and (e) an antenna and/or inductor having a first end coupledto the bottom capacitor electrode and a second end coupled to the topcapacitor electrode.

In a further aspect, the present invention concerns a method ofdetecting an item or object, generally comprising the steps of (a)causing or inducing a current in a surveillance and/or identificationdevice affixed to or associated with the item or object, sufficient forthe device to radiate detectable electromagnetic radiation; (b)detecting the detectable electromagnetic radiation; and optionally, (c)selectively deactivating the device or causing the device to perform anaction.

The invention, in its various aspects, will be explained in greaterdetail below with regard to exemplary embodiments.

Exemplary Methods of Making a Capacitor and/or aSurveillance/Identification Device

In one exemplary implementation, the method for making a capacitorcomprises the steps of: (a) forming a first dielectric layer on aconductive (e.g., electrically functional) substrate; (b) printing a(semi)conductive layer on at least a portion of the first dielectriclayer; (c) etching the dielectric layer using the (semi)conductive layeras a mask; (d) forming a second dielectric layer in a pattern on theconductive substrate and/or the (semi)conductive layer; (e) forming anelectrically conducting feature (e.g., pattern, line, shape, etc.) onthe second dielectric layer, one portion of the electrically conductingfeature contacting the (semi)conductive layer and a second portion ofthe conducting feature contacting the conductive substrate; and (f) ifnecessary or desired, forming a bottom capacitor electrode from theconductive substrate. An exemplary surveillance/identification tagand/or device can be made by further forming an inductor from theconductive substrate or from the electrically conducting “feature.” Thecapacitor may be either linear or non-linear. In preferred embodiments,an EAS, RF, or RFID tag/device is formed according to theabove-described method(s).

In a preferred embodiment, the (semi)conductive layer (e.g., the topcapacitor electrode) is formed by printing a liquid-phase (e.g., GroupIVA element precursor) ink on the dielectric layer. Printing an ink, asopposed to blanket deposition, photolithography and etching, saves onthe number of processing steps, the length of time for the manufacturingprocess, and/or on the cost of materials used to manufacture thecapacitor and/or surveillance/identification device.

The first exemplary method for manufacturing the present capacitorand/or surveillance/identification device is described in detail belowwith reference to FIGS. 1A-6B.

The Substrate

FIGS. 1A-1B respectively show cross-sectional and top-down views of aconductive (e.g., electrically functional) substrate 100 having adielectric layer 110 and (semi)conductive layer 120 formed thereon. Invarious embodiments, the conductive substrate comprises a metallicsubstrate, metal film, metal foil, or metal sheet. Specifically, themetal substrate may comprise aluminum, titanium, copper, silver,chromium, molybdenum, tungsten, nickel, gold, palladium, platinum, zinc,iron, steel (e.g., stainless steel) or any alloy thereof. Other suitableconductive materials are described below with regard to exemplarysurveillance/identification devices (see, e.g., the bottom capacitorelectrode).

For some implementations, the metal for the conductive substrate may bechosen at least in part based on its ability to be anodized into aneffective dielectric. In exemplary embodiments, the conductive substratemay have a nominal thickness of from 5-200 μm (preferably 20-100 μm)and/or a resistivity of 0.1-10 μohm-cm (preferably 0.5-5 μohm-cm).

Prior to subsequent processing, the conductive substrate 100 may beconventionally cleaned and smoothed. This surface preparation may beachieved by chemical polishing, electropolishing and/or oxide strippingto reduce surface roughness and remove low quality native oxides. Adescription of such processes is given in, “The Surface Treatment andFinishing of Aluminum and Its Alloys,” by P. G. Sheasby and R. Pinner,sixth edition, ASM International, 2001, the relevant portions of whichare incorporated herein by reference.

Forming the First Dielectric Layer/Film

As shown in FIGS. 1A-1B, the method further comprises forming a firstdielectric layer 110 on the conductive substrate 100. The firstdielectric layer may be formed by oxidizing and/or nitriding theconductive substrate (or a liquid oxide/nitride precursor formedthereon), in an oxidizing and/or nitriding atmosphere. For example, thedielectric can be formed by oxidizing a liquid silane printed onto ametal substrate (e.g., steel), or by coating the substrate with anotherconductive material that can be oxidized or nitrided (e.g., silicon,aluminum, chromium, hafnium etc.). In the alternative, the dielectricmay be formed by depositing (e.g., by printing liquid phase or chemicalbath deposition processes) a dielectric precursor material (e.g., a SiO₂precursor such as tetraalkylsiloxane or tetraalkoxysilane) andsubsequently converting the precursor to a dielectric film (e.g., bydrying, curing, and/or annealing). However, if the conductive substrateis one that cannot be processed at high temperatures (e.g., aluminum),methods such as printing or vapor deposition are preferred. Afterconverting the precursor material to a dielectric film, additional metaloxides (e.g., TiO₂, ZrO₂, HfO₂, etc.) may be deposited on the film.Thus, in various embodiments, the dielectric may comprise a plurality oflayers.

In other embodiments, the dielectric may be coated/deposited by blanketdeposition techniques. In general, coating refers to a process wheresubstantially the entire surface of a substrate is covered with theformulation. Coating may comprise methods such as spray coating, dipcoating, blade coating, meniscus coating, slit coating, extrusioncoating, pen-coating, microspotting, inkjetting, gravure printing,flexographic printing, or spin-coating. In such embodiments, areas ofthe substrate may be patterned and/or exposed as desired by etchingtechniques known in the art.

In some embodiments, the first dielectric layer can be deposited byvacuum deposition methods (e.g., CVD, PECVD, LPCVD, sputter deposition,etc.). Another method of forming the dielectric employs anodization toform a MOS dielectric and/or a deactivation dielectric. A detaileddescription of forming the dielectric by anodization is found in U.S.Pat. No. 7,286,053, the relevant portions of which are incorporatedherein by reference.

In some implementations, the dielectric (or suitable dielectricprecursor) can be printed onto the conductive substrate. During theprinting process, a liquid-based composition (e.g., a solution,suspension, emulsion, etc.) is selectively deposited in a predeterminedpattern, and with a characteristic resolution (e.g., minimum layoutdimension, spacing, alignment margin of error, or any combinationthereof). Suitable printing processes may include inkjet printing,gravure printing, screen printing, offset printing, flexography, syringedispensing, microspotting, stenciling, stamping, pump dispensing, laserforward transfer, local laser CVD and/or pen-coating. Preferably, thedielectric is printed by inkjet printing. For example, materials such asspin-on-glasses, and/or boron nitride can be printed on the conductivesubstrate. The dielectric layer may be printed such that areas of theconductive substrate are exposed. In the alternative, the dielectriclayer may be printed to cover the entire substrate, and then etchedusing subsequently formed structures as a mask, as illustrated in FIG.2.

The dielectric layer may comprise any suitable electrically insulatingdielectric material. Exemplary dielectric materials are discussed belowwith regard to exemplary surveillance devices (see, e.g., the sectionsherein entitled, “The First and Second Dielectric Layers”). For example,the dielectric insulator of the capacitor may comprise or consistessentially of an organic or an inorganic insulator. In preferredembodiments, the dielectric comprises an oxide and/or nitride of themetal of the conductive/metallic substrate. In various embodiments, thedielectric layer (e.g., structure 110 of FIGS. 1A and 1B) is formedhaving a thickness of from 50 to 500 Å and/or a breakdown voltage offrom about 5 V to less than 50 V, preferably from 10 V to 20 V. However,the dielectric thickness may be adjusted as needed to controlcapacitance, and to control the voltage at which the dielectric isintended to rupture.

Forming the (Semi)Conductive Layer

As shown in FIGS. 1A and 1B, the method further comprises the step ofdepositing a (semi)conductive layer (i.e., top capacitor electrode) 120on the first dielectric layer 110. The (semi)conductive layer may beformed by depositing a metal and/or a semiconductor layer (e.g., lightlydoped, heavily doped, or undoped) on the dielectric. In general, anymethod for depositing the metal and/or semiconductor material may beused, such as printing, or conventional blanket deposition (e.g., bychemical vapor deposition [CVD], low pressure CVD, sputtering,electroplating, spin coating, spray coating, etc.), photolithography andetching. However, printing is preferred.

According to the present method(s), printing may comprise inkjetprinting, gravure printing, screen printing, offset printing,flexography, syringe dispensing, microspotting, stenciling, stamping,pump dispensing, laser forward transfer, local laser CVD and/orpen-coating. Printing allows for greater control of the thickness of theprinted metal/(semi)conductive layer. For example, if a thicker(semi)conductive layer is desired, the number of drops, the drop volume,or the ink volume can be increased. A thicker metal layer may also beachieved by decreasing the pitch between drops in an area wherein athicker (semi)conductive layer (e.g., having lower resistance) isdesired. Furthermore, printing processes allow the contact angle of theprinted ink to be varied locally. To illustrate, a preprinting stepadapted to locally vary the surface energy of the substrate can beperformed so that different metal heights/thicknesses and/or line widthscan be achieved with a single printing step.

In exemplary embodiments, a metal-containing ink is deposited on thedielectric by coating or printing techniques. In variousimplementations, the metal is blanket deposited by spin-coating an ink(e.g., a metal precursor ink) containing the metal-containing material(e.g., metal, organometallic precursor(s), and/or metal nanoparticles),and subsequently curing or annealing the metal. In preferredembodiments, the metal ink is selectively deposited by printing an inkcomprising a precursor of a desired metal (e.g., a silicide-formingmetal) in a solvent, and subsequently curing, drying, and/or annealingthe metal.

The metal-containing ink may comprise or consist essentially of themetal precursor (e.g., metal-containing material) in an amount of from 1to 50 wt. % of the ink (or any range of values therein), and a solventin which the metal-containing material is soluble. Such metal-containinginks/precursors, as well as exemplary metals and/or othermetal-containing ink formulations, are discussed in greater detail belowwith regard to exemplary surveillance/identification devices.Furthermore, metal-containing inks, and methods of forming conductivestructures/layers (e.g., semiconductor layers) from such inks aredescribed in co-pending U.S. patent application Ser. Nos. 10/616,147,10/949,013, 11/246,014, 11/249,167, 11/452,108, 11/888,949, 11/867,587,12/131,002, and 12/175,450 (Attorney Docket Nos. KOV-004, IDR0302,IDR0422, IDR0423, and IDR0502, IDR0742, IDR0884, IDR1263, IDR1052),respectively filed on Jul. 8, 2003, Sep. 24, 2004, Oct. 6, 2005, Oct.11, 2005, Jun. 12, 2006, Aug. 3, 2007, Oct. 4, 2007, May 30, 2008, andJul. 17, 2008, the relevant portions of each of which are incorporatedherein by reference.

In some embodiments, the (semi)conductive layer may be printed as amixture of two or more metal precursors, or alternatively, of one ormore metal precursors, and one or more semiconductor precursors. Inother embodiments, two or more metal inks may be successively printedand dried as laminated layers. The mixtures and/or laminates can beoptionally heated or otherwise reacted during or after formation to formthe (semi)conductive layer.

The printed metal-containing/precursor ink may be dried by heating thesubstrate at a temperature and for a length of time sufficient to removeany solvent in the ink. Temperatures for removing solvents range fromabout 80° C. to about 150° C., or any range of temperatures therein(e.g., from about 100° C. to about 120° C.). The lengths of time forremoving solvents from a printed ink within these temperature ranges arefrom about 1 second to about 10 minutes, 10 seconds to about 5 minutes,or any range of times therein (e.g., from about 30 seconds to about 5minutes, or about 1 minute to 3 minutes, etc.). Heating may take placeon a conventional hotplate or in a conventional furnace or oven.Optionally, the heating may occur in an inert atmosphere as described inco-pending U.S. application Ser. No. 11/888,949 (Attorney Docket No.IDR0742), filed Aug. 3, 2007, the relevant portions of which areincorporated herein by reference.

After the metal-containing ink has been dried to remove the solvent, theremaining material may be subject to an annealing process at atemperature and for a length of time sufficient to obtain desiredelectrical and/or physical properties, as well as proper adhesion to theunderlying dielectric layer. Annealing temperatures range from about100° C. to about 300° C., or any range of temperatures therein (e.g.,from about 150° C. to about 250° C.). The annealing time generallyranges from about 1 minute to about 2 hours. In preferred embodiments,the metal-containing film is annealed from about 10 minutes to about 1hour (or any range of this therein, e.g., from about 10 to about 30minutes).

In various embodiments, annealing occurs in a furnace or oven, andoptionally in an inert or reducing atmosphere. For example, themetal-containing precursor film may be exposed to a reducing agent, andheated at a temperature ranging from greater than ambient temperature toabout 200-400° C., depending on the substrate. This process hasparticular advantages in embodiments where the substrate cannot beprocessed at a relatively high temperature (e.g., aluminum foil, apolycarbonate, polyethylene and polypropylene esters, a polyimide,etc.). A sealable oven, furnace, or rapid thermal annealing furnaceconfigured with a vacuum source and reducing/inert gas sources may beused for providing the reducing atmosphere and heat (thermal energy) forheterogeneous reduction. In the alternative, the metal precursor filmmay be thermally decomposed to the elemental metal using a heat source(e.g., a hotplate) in an apparatus in which the atmosphere may becarefully controlled (e.g., a glove box or dry box). Suchannealing/reducing processes and alternatives thereof are described inco-pending U.S. application Ser. Nos. 11/888,949 and 12/131,002(Attorney Docket Nos. IDR0742 and IDR1263), respectively filed Aug. 3,2007 and May 30, 2008, the relevant portions of which are incorporatedby reference herein.

In some implementations, the (semi)conductive layer may comprise asemiconductor layer/component formed at a thickness of from 50 to 200nm. In such embodiments, the semiconductor layer may comprise one ormore (doped) Group IVA elements (e.g., silicon and/or germanium), a“III-V” material (e.g., GaAs), and/or an organic or polymericsemiconductor. For example, depositing the semiconductor material orsemiconductor material precursor might comprise depositing aliquid-phase Group IVA element precursor ink on the dielectric film.Suitable liquid-phase Group IVA element precursor inks and methods forprinting such inks are disclosed in co-pending U.S. application Ser.Nos. 10/616,147, 10/789,317, and 11/867,587, respectively filed Jul. 8,2003, Feb. 27, 2004, and Oct. 4, 2007 (Attorney Docket Nos. KOV-004,IDR0020, and IDR0884, respectively), the relevant portions of each ofwhich are incorporated herein by reference.

In some embodiments, the (semi)conductive layer may be formed byelectro(less) plating processes. In these embodiments, printed metallayer (e.g., Pd) can serve as a seed layer for electroless deposition orelectroplating of other metals (e.g., Ag, Cu, Ni, etc.) and/or forming ametal silicide if so desired. A conductive metal (e.g., bulk conductivemetal) may be plated onto the metal seed layer and/or onto a metalsilicide. The resulting structure can be subsequently annealed toimprove the electrical contact between the silicide and the platedmetal. A cleaning and/or surface roughening step may be applied to thedielectric layer, and/or the dielectric layer may be etched beforeprinting the metal ink to improve the adhesion of the plated metal tothe dielectric layer. Plating the conductive metal may comprise eitherelectroless plating or electroplating. The conductive metal may compriseAl, Ag, Au, Cu, Pd, Pt, Ni, Cr, Mo, W, Ru, Rh, and alloys and/ormixtures thereof. Optionally, the bulk conductive metal may be furtherannealed to improve one or more physical and/or electricalcharacteristics.

It is generally desirable to increase the frequency response of thecapacitor (e.g., MOS capacitor circuit) used in asurveillance/identification device, and provide a low series resistancefor the circuitry in the device. This enables high frequency operation(e.g., in the range of 125 KHz and above, including, for example, 8.2MHz or 13.56 MHz). To achieve sufficiently low series resistance and/orincreased frequency response, the material used to form the(semi)conductive layer (e.g., semiconductor component/layer) can berecrystallized. The recrystallization process may improve the carriermobility and/or dopant activation of the conductive layer/semiconductorcomponent. Mobilities approaching 10 cm²/vs and higher may be requiredfor low dissipation and/or effective high Q. Low dissipation generallyrequires low series resistance, preferably less than 5 Ohms for theentire circuit, along with a large parallel resistance (generallyprovided by a low leakage dielectric) of at least 10⁴ Ohms, preferably≧10⁵ Ohms, most preferably >10⁶ Ohms. Effective high Q provides lowfield and/or high read range operation in MHz range frequencies andhigher. Preferred techniques for recrystallization are described in U.S.Pat. No. 7,286,053 (Attorney Docket No. IDR0312), issued Oct. 23, 2007,the relevant portions of which are incorporated by reference herein.

Various embodiments of the present method may comprise forming the(semi)conductive layer/top capacitor plate by printing a dopedsemiconductor layer (e.g., lightly or heavily doped). Heavily doping, oralternatively, siliciding the semiconductor material may also increasethe frequency response of the EAS tag MOS capacitor circuit, anddecrease series resistance. A doped semiconductor layer may be formed byconventionally implanting a conventional semiconductor dopant, diffusingthe dopant into the semiconductor material from a solid or vapor dopantsource, by printing a doped semiconductor or semiconductor precursorsuch as a B- or P-containing (cyclo)silane (see co-pending U.S.application Ser. Nos. 10/616,147 and 10/789,317, respectively filed Jul.8, 2003 and Feb. 27, 2004 [Attorney Docket Nos. KOV-004 and IDR0020,respectively], the relevant portions of each of which are incorporatedherein by reference), and/or by laser forward transfer of a dopedsemiconductor layer or dopant diffusion source layer.

In some instances, it may be desirable to provide a relatively low levelof doping (a concentration of <5×10¹⁸ cm⁻³ electrically active dopantatoms) in the bulk of the active semiconductor layer 30 to control theCV slope of the surveillance/identification device, and also reduce theseries resistance of the semiconductor component, thereby allowinghigher Q and/or higher frequency operation (see U.S. Pat. No. 7,286,053,issued Oct. 23, 2007 [Attorney Docket No. IDR0312], the relevant portionof which is incorporated herein by reference).

Additional formulations and/or methods of forming (semi)conductivelayers are discussed below with regard to the second exemplary method offorming a capacitor and/or surveillance/identification device. Theformulations and techniques described below are applicable to formingthe (semi)conductive layer herein to the extent that they are notcontradictory.

Forming the Second Dielectric Layer

Referring now to FIGS. 3A-3B (which respectively show cross-sectionaland top-down views of a capacitor formed according to the presentexemplary method), the present method of manufacturing a capacitorand/or a surveillance and/or identification device may further comprisethe step of depositing/forming a second dielectric (e.g., an interlayerdielectric) 130 on at least a portion of the (semi)conductive layer. Asshow in FIG. 3A, the second dielectric layer may also be formed onportions of the conductive substrate. In general, the second dielectriclayer is formed in a desired pattern. The second dielectric layerprovides an electrical separation (e.g., in terms of leakage andcapacitance) between a subsequently formed inductor and a subsequentlyformed electrically conducting feature. The second dielectric layer maybe formed according to any suitable method known in the art.

For example, in one embodiment, the second dielectric layer 130 isblanket deposited over the entire device and selected portions thereofremoved (e.g., by conventional photolithography and etching) to form aplurality of contact holes (e.g., 135 of FIGS. 3A-3B) in the seconddielectric layer 130 that is sufficient to expose at least a portion ofthe conductor layer/top capacitor electrode 120 and/or portions of theconductive substrate 100. Blanket deposition of the second dielectriclayer 130 may be done by extrusion, blade, dip, linear, spin or othercoating technique, or in the alternative, by local deposition techniquessuch as printing or dispensing. In the case of printing or dispensing,this may also serve the purpose of patterning the second dielectriclayer. Patterning of the second dielectric layer may be done by directprinting of the dielectric precursor materials (e.g., by inkjetprinting, screen, gravure, flexography, laser forward transfer, etc.) orindirect patterning (such as with a photo- and/or thermo-patternableprecursor material that is exposed by a photomask, thermal or laserpattern and developed, or extrinsically via a patterning process such asconventional photolithography, embossing or similar technique). In someimplementations, the etching process may comprise laser ablation,mechanical penetration or other etching or dielectric removal techniquesknown in the art.

In alternate embodiments, the second dielectric layer is selectivelydeposited on one or more predetermined portions of the structure to forma desired pattern, including but not limited to the (semi)conductivelayer and the conductive substrate. In preferred embodiments, selectivedeposition may be accomplished using any of the various printingprocesses and/or techniques discussed herein. Specifically, in someimplementations, the second dielectric layer 130 may be formed by (i)printing a liquid-phase dielectric precursor ink on at leastpredetermined portions of the (semi)conductive layer 120 (and optionallythe conductive substrate 100), and (ii) drying and/or curing thedielectric precursor/ink to form the second dielectric layer 130. Aspreviously stated, the liquid-phase dielectric precursor ink may beselectively printed on the structure such that contact holes (e.g., 135of FIGS. 3A-3B) are formed to expose a portion of the (semi)conductivelayer/top capacitor electrode and/or the conductive substrate.

The liquid-phase dielectric precursor ink used in printing and/orcoating processes may comprise a compound of the formula A_(n)H_(y),where n is from 3 to 12, each A is independently Si or Ge, and y is aneven integer of from n to 2n+2, and preferably a compound of the formula(AH_(z))_(n), where n is from 5 to 10, each A is independently Si or Ge,and each of the n instances of z is independently 1 or 2. Thecorresponding silicon and/or germanium oxide film may be formed bycuring the precursor film (e.g., Group IVA element precursor film) in anoxidizing atmosphere, at a temperature of 300° C., 350° C. or 400° C. ormore, but less than the melting temperature of the conductive substrate100, in the presence of oxygen, ozone, N₂O, NO₂, or other oxidizing gas,which may be diluted in an inert carrier gas such as nitrogen, argon orhelium. In the alternative, other solution-based dielectrics, includingspin on glasses, organic dielectrics, etc., may be applied by printingor other conventional coating steps. Such dielectric materials arediscussed in detail below with regard to exemplarysurveillance/identification devices. In addition, other varioustechniques for forming the second dielectric layer, and the benefitsthereof, are described in U.S. Pat. No. 7,286,053, the relevant portionsof which are incorporated herein by reference.

In general, suitable materials for forming the dielectric layer include,but are not limited to, spin on glasses (which may be photodefinable ornon-photodefinable, in the latter case patterned by direct printing orpost deposition lithography); polyimides (which may be photodefinableand/or thermally sensitized for thermal laser patterning, ornon-photodefinable for patterning by direct printing or post depositionlithography); BCB or other organic dielectrics such as SiLK® dielectricmaterial (SILK is a registered trademark of Dow Chemical Co., Midland,Mich.); low-k interlayer dielectrics formed by sol-gel techniques;plasma enhanced (PE) tetraethylorthosilicate (TEOS) (i.e., SiO₂ formedby plasma-enhanced CVD of tetraethylorthosilicate); and laminatedpolymer films such as polyethylene (PE), polyester, or highertemperature polymers such as PES, polyimide or others that arecompatible with subsequent high temperature processing. The seconddielectric layer may have a thickness of at least one micron, preferablyfrom 2 to 20 μm, more preferably from 5 to 10 μm.

Forming the Electrically Conducting Pattern

Referring now to FIGS. 4A-4B, an electrically conducting feature 140(e.g., “line,” “pattern,” and/or “shape”) is formed on the seconddielectric layer to provide electrical communication between the(semi)conductive layer (top capacitor electrode) and the conductivesubstrate 100 (from which the surveillance/identification deviceinductor and bottom capacitor plate can be subsequently formed, as willbe seen in FIGS. 6A-6B and discussed below). In general, theelectrically conducing feature 140 can be formed by any suitable methodknown in the art. In exemplary implementations, the feature is formed byprinting processes such as inkjet printing, microspotting, stenciling,stamping, syringe dispensing, pump dispensing, screen printing, gravureprinting, offset printing, flexography, laser forward transfer, and/orlocal laser CVD. In such printing processes, the feature may be formedby selectively printing a conductor ink on the second dielectric layer.In other embodiments, forming the feature comprises depositing aconductor material on the dielectric, and then etching the conductormaterial. In some embodiments, forming the feature may further compriseforming an interconnect pad near the outer coils of the inductor (formedfrom the conductive substrate as illustrated in FIGS. 6A-6B, and asdiscussed below) and (semi)conductive layer.

The electrically conducting feature may be formed using variousconductive metals. For example, the feature may comprise aluminum,titanium, copper, silver, chromium, molybdenum, tungsten, nickel, gold,palladium, platinum, zinc, iron, stainless steel, or any alloy thereof.In some implementations, the feature may consist essentially silver,gold copper, aluminum, or a conductive alloy thereof. In exemplaryembodiments, the feature may be formed using the same material as theconductive substrate and/or the (semi)conductive layer (e.g., thecapacitor electrodes). However, the invention is not limited as such,and the feature may comprise different materials than those of theconductive substrate and (semi)conductive layer. In someimplementations, dopants, siliciding components, or other work functionmodulation agents and/or tunneling barrier materials may be included inthe feature 140. Such inclusion may reduce the series resistance andincrease the Q, and overall performance of thesurveillance/identification device.

Passivation

As shown in FIG. 5, after forming the electrically conducting feature140, a passivation layer 150 may optionally be formed over thestructure. Such a passivation layer 150 generally adds mechanicalsupport to the surveillance/identification device, particularly duringthe subsequent processing (e.g., the substrate etching process to formthe bottom capacitor electrode and/or the inductor/antenna as discussedbelow). Furthermore, forming a passivation layer may prevent the ingressof water, oxygen, and/or other species that could cause the degradationor frequency drifting of device performance. The passivation layer 150may be formed by conventionally coating the upper surface of thestructure with one or more inorganic barrier layers such as apolysiloxane and/or a nitride, oxide and/or oxynitride of silicon and/oraluminum, and/or one or more organic barrier layers such as parylene, afluorinated organic polymer (e.g., as described above), or other barriermaterial known in the art. Alternatively or additionally, thepassivation layer may comprise an underlying dielectric layer. Theunderlying dielectric layer may be formed from a material having lowerstress than that of the overlying passivation layer. To illustrate, theunderlying dielectric layer may comprise an oxide (e.g., SiO₂, TEOS,undoped silicate glass [USG], fluorosilicate glass [FSG],borophosphosilicate glass [BPSG], etc.), and the passivation layer maycomprise silicon nitride or a silicon oxynitride. In some embodiments,the passivation layer may have a thickness that is slightly greater thanthe thickness of the dielectric layer.

Forming the Inductor and/or Lower Capacitor Plate

FIGS. 6A-6B respectively show cross-sectional and bottom views of acapacitor and/or surveillance/identification device, in which theconductive substrate 100 has been patterned and etched to form a bottomcapacitor electrode 104, and an inductor/antenna 106 a-106 e. Inexemplary embodiments, forming the inductor comprises forming aninterconnect and/or contact pad 102 to provide an interconnection sitefor the feature to electrically connect the inductor/antenna 106 a-106 eto the (semi)conductive layer/top capacitor electrode 120. Thus, thepresent method further comprises etching the electrically functionalsubstrate, preferably wherein the etching forms an inductor and/or abottom capacitor electrode (i) capacitively coupled to the(semi)conductive layer 120 (e.g., top capacitor electrode). However, inalternative embodiments, the metal/alloy for capacitor plate 104 andinductor 106 a-106 e (and, optionally, interconnect pad 102) may beconventionally deposited or printed onto the backside of dielectric film112.

The substrate 100 (see FIGS. 6A-6B) can be patterned by conventionalphotolithography, or by contact printing or laser patterning of a resistmaterial applied to the backside (non-device side) of substrate 100. Thesubstrate 100 can then be etched with standard wet (e.g., aqueous acid)or dry (e.g., chlorine, boron trichloride) etches to form the bottomcapacitor electrode 104, a plurality of concentric rings or coils (e.g.,inductor/antenna 106 a-106 e), and optionally interconnect and/orcontact pad 102. The patterning and/or etching steps may be thermally,optically or electrically assisted. The substrate 100 may also bepatterned by direct means such as milling, laser cutting, stamping, ordie-cutting.

A backing and/or support layer may be desired or required to providemechanical stability and/or protection for the non-passivated side ofthe device 100 during later handling and/or processing. Thus, thepresent manufacturing method may further comprise the step of adding asupport or backing to the etched electrically functional substrate. Thisbacking layer may be added by lamination to paper or a flexiblepolymeric material (e.g., polyethylene, polypropylene, polyvinylchloride, polytetrafluoroethylene, a polycarbonate, an electricallyinsulating polyimide, polystyrene, copolymers thereof, etc.) with theuse of heat and/or an adhesive. Where the backing comprises an organicpolymer, it is also possible to apply the backing layer from a liquidprecursor by dip coating, extrusion coating or other thick film coatingtechnology. In addition to providing mechanical support to the device, asupport and/or backing layer may also provide an adhesive surface forsubsequent attachment or placement of the surveillance/identificationdevice onto an article to be tracked or monitored.

A second exemplary method for manufacturing the present capacitor and/orsurveillance/identification tag/device is described in detail below withreference to FIGS. 7A-11. Some of the steps and/or processes of thesecond method are the same as or substantially similar to those of thefirst method described above, and will be referenced as such.Furthermore, embodiments of the first method that are not inconsistentmay be applied to the second method as described herein.

Forming the First (Semi)Conductive Layer

FIGS. 7A-7B respectively show cross-sectional and top-down views of asubstrate 200 having a (semi)conductive layer 210 formed thereon. Whilethe (semi)conductive layer 210 may be formed on any type of substrateknown in the art, in preferred embodiments, the substrate comprises aninsulating and/or otherwise electrically inert material. Varioussubstrates may include, but are not limited to glass (e.g., quartz)sheets, wafers, slips, plastic and/or metal foils or slabs, Si wafers,etc., any of which may include one or more additional layers (e.g.,buffer, mechanical support, etc.).

Suitable electrically inert or inactive substrates may comprise a plate,disc, and/or sheet of a glass, ceramic, dielectric and/or plastic. If anelectrically conductive substrate is selected as the substrate, itshould have an insulator layer between the substrate and anyelectrically active layer or structure formed thereon. However, theinsulator layer is not needed in locations where an electrical contactwill be made between the structures and/or devices on the insulator anda structure formed in the conductive substrate. In embodiments requiringan insulator layer, the insulator layer may comprise a spin-on glassbarrier layer having a thickness of about 1 μm. In some implementationsglass and plastic substrates may further contain a planarization layerthereon to reduce the surface roughness of the substrate. It may beadvantageous to form a surface energy modifying layer of a material thatimproves the adhesion and/or that controls the spreading of a subsequentmaterial (e.g., a printable ink) printed or otherwise deposited thereon,and/or a barrier layer thereon.

In some embodiments, the first (semi)conductive layer (e.g., the bottomcapacitor electrode) may be formed by coating, printing, or otherwisedepositing a conductor ink (e.g., metal ink or metal precursor ink) onthe substrate. Preferably, the first (semi)conductive layer is formed byprinting. In alternative embodiments, the first (semi)conductive layermay be formed by plating (e.g., printing and/or laser writing) a seedlayer of metal (e.g., Pd) using nanoparticle- and/or compound-basedmetal ink (e.g., PdCl₂-containing ink). A bulk conductor (e.g., Co, Ni,Cu, Pd, etc.) may then be selectively deposited by electroless orelectroplating onto the metal seed layer. In addition to thePdCl₂-containing ink, metal nanoparticles comprising cobalt, nickel,platinum, palladium, titanium, tungsten or molybdenum (particularlypalladium) are preferred for the seed layer. Preferred methods for laserwriting and/or laser patterning are described in co-pending U.S. PatentPub. No. 2008-0048240, published on Feb. 28, 2008, the relevant portionsof which are incorporated herein by reference.

In other embodiments, the conductor ink may be blanket deposited byspin-coating an ink containing the metal-containing material onto thesubstrate, and then curing or annealing the metal, organometallicprecursor(s) and/or metal nanoparticles to form the first(semi)conductive layer. In such embodiments, the metal layer formed maybe laser patterned to form the desired structure. Exemplary conductiveinks/precursor inks are described below with regard to exemplarysurveillance/identification devices (see, e.g., forming the bottomand/or top capacitor electrode).

In exemplary embodiments, printing comprises inkjet printing,microspotting, stenciling, stamping, syringe dispensing, pumpdispensing, screen printing, gravure printing, offset printing,flexography, laser forward transfer, or local laser CVD. Such techniquesfor printing a liquid metal and/or precursor ink are described in U.S.Pat. Nos. 7,152,804 and 7,413,513, and in co-pending U.S. patentapplication Ser. Nos. 10/616,147, 11/203,563, and 12/175,450 (AttorneyDocket Nos. KOV-004, IDR0213, and IDR1052), filed on Jul. 8, 2003, Aug.11, 2005, and Jul. 17, 2008 respectively, the relevant portions of whichare incorporated herein by reference.

In preferred embodiments, the metal/conductor ink is selectivelydeposited by inkjet printing. In such embodiments, the conductor ink(e.g., comprising a silane or Group IVA element precursor) may beselectively printed to form a desired pattern, and then subsequentlydried and cured (e.g., by heating and/or annealing) for a length of timesufficient to cross-link, oligomerize, and/or polymerize the silane orGroup IVA element precursor and/or increase the average molecularweight, increase the viscosity and/or reduce the volatility of thecomposition. The resulting semiconductor film pattern can be partiallyor substantially completely crystallized to form a polycrystalline(e.g., polysilicon) film. Techniques for local printing of a liquidsemiconductor precursor ink directly onto a substrate (or surface filmthereof to form a semiconductor layer are described in co-pending U.S.patent application Ser. Nos. 10/949,013 and 11/203,563 (Attorney DocketNos. IDR0302 and IDR0213), filed on Sep. 24, 2004 and Aug. 11, 2005,respectively, the relevant portions of which are incorporated herein byreference.

In preferred embodiments, the (semi)conductive layer may be formed byprinting a conductor (e.g., semiconductor) ink that is lightly orheavily doped (e.g., n-doped silane). Exemplary techniques for printingsuch inks, and determining and/or controlling the dopant levels in theprecursor inks and active films formed from the precursor inks aredescribed in greater detail in co-pending application Ser. Nos.10/949,013, and 11/867,587 (Attorney Docket Nos. IDR0302, and IDR0884)respectively filed on Sep. 24, 2004, and Oct. 4, 2007 the relevantportions of which are incorporated herein by reference.

In various embodiments that use an ink comprising or consistingessentially of a Group IVA element source (e.g., silane and/ornanoparticle-based precursor to Si or doped Si), the step of forming the(semi)conductive layer (e.g., bottom capacitor electrode) may furthercomprise drying and curing (e.g., heating) the liquid-phase precursorink after printing.

In some implementations, the conductor (e.g., metal/metal precursor) inkmay be dried and cured after the printing step. The drying process mayhelp to remove solvents and/or other additives in the conductor inkformulation. However, some additives may not be completely removed untilthe conductor ink is heated or annealed under conditions sufficient tosubstantially completely remove any remaining additives. The curingprocess is described in co-pending U.S. patent application Ser. No.10/949,013 (Attorney Docket No. IDR0302) filed on Sep. 24, 2004, therelevant portions of which are incorporated herein by reference. Whenthe conductor ink comprises a doped formulation, the curing/heating stepmay also activate part of the dopant. However, dopant activation may bemore likely to occur during a subsequent crystallization step (e.g., bylaser irradiation and/or thermal annealing).

Additional formulations and/or methods of forming (semi)conductivelayers are discussed above with regard to the first exemplary method.The formulations and techniques described above are generally applicableto forming the first (semi)conductive layer of the second exemplarymethod to the extent that they are not inconsistent.

Forming the First Dielectric Layer and the Top Capacitor Electrode

Referring now to FIG. 8, a first dielectric layer 220 (e.g., capacitordielectric layer) is formed on the first (semi)conductive layer 210(e.g., bottom capacitor electrode). The capacitor dielectric layer 220may be formed using any of the methods and/or techniques described abovewith regard to the first exemplary method. In preferred embodiments, thefirst dielectric layer is printed using any of the printing methodsdescribed herein.

FIGS. 9A-9B show cross-sectional and top-down views respectively of thecapacitor after the top capacitor electrode 230 is formed on the first(e.g., capacitor) dielectric layer 220. In general, the top electrode isformed such that a portion of the capacitor dielectric layer 220 remainsexposed. The top electrode 230 may be formed using any of the depositionformulations, methods and/or techniques discussed herein with regard toforming (semi)conductive layers and/or structures. In preferredembodiments, the top electrode 230 is selectively printed on thecapacitor dielectric 220, or alternatively the top capacitor electrodemay be printed/coated and then subsequently etched. The top electrode230 may be formed from the same conductive material used to form thefirst (semi)conductive layer 210, or in the alternative, the two(semi)conductive layers (bottom and top capacitor electrodes, 210 and230 respectively) may be formed from different conductive materials.

Forming the Second Dielectric Layer

As shown in FIG. 10, a second dielectric layer 240 is formed on thesubstrate 200. In the second exemplary method, the second dielectriclayer 240 has a first contact hole 215 that exposes the first(semi)conductive layer 210, and a second contact hole 235 exposing thetop capacitor electrode 230. The second dielectric layer 240 may beformed by blanket deposition techniques, as described herein, and thenthe contact holes 215/235 formed using etching technique also describedherein. In the alternative, the second dielectric layer 240 can beselectively printed using any of the printing techniques describedherein such that portions of the first (semi)conductive layer (bottomcapacitor electrode) and the top capacitor electrode are exposed. Insome embodiments, the second dielectric layer may be selectively printedto include the first and second contact holes therein, and thedielectric layer may be subsequently etched to widen the contact holesas desired.

The second dielectric layer may be doped or undoped. Suitable inks forprinting a doped dielectric layer (e.g., 240) include compounds and/orpolymers containing dopant and/or dielectric precursor atoms such asphosphorous and oxygen (which may further include silicon, carbon,hydrogen, and/or nitrogen), boron (which may further include silicon,carbon, hydrogen, oxygen, and/or nitrogen), arsenic and/or antimony(either of which may further include silicon, carbon, hydrogen, and/oroxygen, optionally in a suitable solvent (see e.g., U.S. patentapplication Ser. Nos. 11/818,078, 11/888,949, and 11/888,942, [AttorneyDocket Nos. IDR0813, IDR0742, and IDR0743, respectively], filed on Jun.12, 2007, Aug. 3, 2007, and Aug. 3, 2007, respectively, the relevantportions of which are incorporated herein by reference. Exemplarydopant-containing dielectric compounds, including examples of precursorsfor a doped glass dielectric, are described in U.S. patent applicationSer. No. 11/842,884 (Attorney Docket No. IDR0982), filed on Aug. 21,2007, the relevant portions of which are incorporated herein byreference.

Forming the Inductor and/or Surveillance/Identification Device

As shown in FIG. 11, the above-described capacitor 250 formed accordingto the second exemplary method, can be coupled/electrically connected toan inductor and/or antenna 300/310 to form a surveillance and/oridentification tag or device. The antenna and/or inductor may comprisethe antenna, the inductor, or both. Specifically, a firstinterconnect/contact pad of the inductor/antenna 312 (the “outer contactpad”) electrically contacts the top capacitor electrode 230 where it isexposed by the contact hole 235 in the second dielectric layer.Similarly, a second interconnect/contact pad of the inductor/antenna 314(the “inner contact pad”) electrically contacts the first(semi)conductive layer 210 (e.g., the bottom capacitor electrode) whereit is exposed by the contact hole 215 in the second dielectric layer.The interconnect/contact pads 312 and 314 may comprise a metal bump oranisotropic conductive paste (ACP).

The inductor may be formed using methods generally known in the art. Forexample, the inductor may be formed on a second substrate by blanketdeposition, photolithographic masking, and etching and/or cuttingprocesses. Alternatively or additionally, the inductor/antenna may beformed using any of the printing techniques discussed herein. Generally,the antenna and/or inductor comprises a metal. The metal may be onecommercially available, such as a foil (e.g., aluminum, stainless steel,copper, or an alloy thereof). The inductor/antenna may be formed on asecond substrate 300, and then subsequently attached to the capacitor250.

The attachment process may include various physical bonding techniques,such as gluing, as well as establishing electrical interconnection(s)via wire bonding, anisotropic conductive epoxy bonding, ultrasonics,bump-bonding or flip-chip approaches. This attachment process ofteninvolves the use of heat, time, friction or ultrasonic energy (e.g.,between the contact pads of the inductor and the capacitor electrode),and/or UV exposure. Generally, temperatures of less than 200° C. (e.g.,less than 150° C., 90-120° C., or any other range of values therein) arerequired for proper attachment. In alternative embodiments, thecapacitor may be printed directly onto the substrate including theinductor and/or antenna (e.g., planar spiral inductor).

In exemplary embodiments, the inductor/antenna is formed as a continuousstructure. However, in some embodiments comprising both an antenna andan inductor, the inductor may function as a tuning inductor (see, e.g.,U.S. Pat. No. 7,286,053). In such embodiments, the inductor may not becontinuous, and instead comprise a first (outer) inductor coupled to onecapacitor electrode and a second (inner) inductor coupled to a secondcapacitor electrode. The present method may further comprise forming asupport and/or backing material on a surface of the inductor usingmethods known in the art, and as discussed herein with regard to thefirst exemplary method.

It should be noted that many other embodiments would be apparent to oneof skill in the art. Thus, the present invention is not limited to theembodiments described herein. For example, the structures may beinverted, formed laterally, etc., rather than using the order of stepsdisclose above.

Exemplary Surveillance and/or Identification Devices

A second aspect of the invention relates to a surveillance and/oridentification devices. A first general embodiment is shown in FIGS.6A-6B and comprises (a) a unitary conductive structure comprising abottom capacitor electrode and an inductor, (b) a first dielectric layeron the bottom capacitor electrode and inductor, (c) a top capacitorelectrode having a dome-shaped profile on the first dielectric layer,(d) a second dielectric layer on the top capacitor electrode, and theconductive structure, and (e) an electrically conductive feature on thesecond dielectric layer, one portion of the electrically conductingfeature contacting the top capacitor electrode and a second portion ofthe conducting feature contacting the conductive material. In general,the unitary conductive structure may constitute a conductive substrateon which the semiconductor structures are formed and from which thebottom capacitor electrode and the inductor/antenna are subsequentlyformed, as described above with regard to the first exemplary method.Optionally, the structure may further comprise a passivation layer onthe substrate.

A second general embodiment is shown in FIG. 11, and comprises (a) abottom capacitor electrode having a dome-shaped profile on a substrate,(b) a first dielectric layer on the bottom capacitor electrode, (c) atop capacitor electrode on the first dielectric layer, (d) a seconddielectric layer having a dome-shaped profile on the substrate havingfirst and second contact holes therein exposing the bottom capacitorelectrode and the top capacitor electrode, and (e) an antenna and/orinductor having a first end coupled and/or connected to the bottomcapacitor electrode and a second end coupled and/or connected to the topcapacitor electrode. In the various embodiments described herein, thesurveillance and/or identification device preferably comprises an EAS,RF, and/or RFID tag or device.

The Substrate

Generally, the substrate may comprise any suitable substrate known inthe art, and depends largely on which of the above-described methodswill be used to make the device. For example, the first exemplary device(manufactured according to the first exemplary method, and correspondingto FIGS. 6A-6B) generally comprises a unitary conductivestructure/substrate, from which the bottom capacitor electrode 104 andthe inductor/antenna 106 a-106 e can be formed. Preferably, the unitaryconductive structure (e.g., substrate) comprises a metal film, metaloil, or metal sheet. Exemplary metal structures/substrates comprisealuminum, titanium, copper, silver, chromium, molybdenum, tungsten,nickel, gold, palladium, platinum, zinc, iron, steel (e.g., stainless),or any alloy thereof. Advantages of unitary conductive material, such asa metal foil are discussed in U.S. Pat. No. 7,286,053.

In various embodiments, other conductive materials may be used includingconductive polymers, such as doped polythiophenes, polyimides,polyacetylenes, polycyclobutadienes and polycyclooctatetraenes;conductive inorganic compound films, such as titanium nitride, tantalumnitride, indium tin oxide, etc.; and/or doped semiconductors, such asdoped silicon, doped germanium, doped silicon-germanium, doped galliumarsenide, doped (including auto-doped) zinc oxide, zinc sulfide, etc. Invarious embodiments, the metal/alloy for used for the conductivesubstrate may comprise a multi-layer structure, such as aluminum,tantalum or zirconium deposited (e.g., by sputtering or CVD) onto a thincopper sheet or foil, or copper deposited (e.g., by electroplating) ontoa thin aluminum sheet or foil. However, in preferred embodiments, theconductive substrate comprises or consists essentially of aluminum.

Now referencing the second exemplary device (manufactured according tothe second exemplary method, and corresponding to FIG. 11), thesubstrate may comprise any type of suitable substrate material known inthe art (e.g., glass sheets, wafers, slips, plastic, and/or metal foilsor slabs, Si wafers, etc). However, in preferred embodiments, thesubstrate in this exemplary embodiment comprises an insulating and/orotherwise electrically inert material. For example, suitableelectrically inert or inactive substrates may comprise a plate, disc,and/or sheet of a glass (e.g., quartz), ceramic, dielectric and/orplastic. In embodiments comprising an electrically conductive substrate(e.g., metal foil, or any of the conductive substrates describedherein), the substrate should further comprise an insulator layerbetween the substrate and electrically active structures subsequentlyformed thereon. For example, such insulator layers may comprise aspin-on glass barrier layer having a thickness of about 1 μm.

In implementations comprising a glass and/or plastic substrate, thesubstrate may further comprise a planarization layer thereon to reducesurface roughness of the substrate. In general, the substrate and/orconductive unitary material has a nominal thickness of thickness of from5 to 200 μm (preferably from 20 to 100 μm) and in the embodimentsutilizing a conductive substrate, a resistivity of 0.1-10 μohm-cm(preferably from 0.5 to 5 μohm-cm, and in one embodiment, about 3μohm-cm).

The Bottom and Top Capacitor Electrodes

In general, the bottom capacitor electrode comprises a first metal and(1) is formed from the conductive substrate, and thus comprises one ofthe conductive materials discussed above with regard to exemplaryconductive substrates (e.g., metal sheet, metal foil, etc.), or (2) isdeposited on the substrate, and comprises any suitable conductivematerial (e.g., metal/conductor ink, metal precursor ink, seed/bulkmetal, semiconductor ink, etc.). The top capacitor electrode is printedor otherwise deposited on the dielectric layer, and comprises anysuitable conductive material described herein. The top capacitorelectrode generally comprises a second metal, which may be the same asthe first metal or it may comprise a different metal than the firstmetal of the bottom capacitor electrode. Preferably, at least one of thecapacitor electrodes (e.g., top electrode, bottom electrode, or both)has a dome-shaped profile. Structures having dome-shaped profiles andvarious methods of forming such structures are described in co-pendingU.S. patent application Ser. Nos. 12/114,741 and 12/243,880 (AttorneyDocket Nos. IDR1102 and IDR1574), respectively filed on May 2, 2008 andOct. 1, 2008, the relevant portions of which are incorporated herein byreference.

As previously discussed, in some implementations, the bottom capacitoris formed from the conductive substrate (e.g., the conductive unitarymaterial), and may comprise aluminum, titanium, copper, silver,chromium, molybdenum, tungsten, nickel, gold, palladium, platinum, zinc,iron steel, stainless steel, or an alloy thereof. Still, in otherimplementations, the bottom capacitor layer may comprise conductivepolymers, such as doped polythiophenes, polyimides, polyacetylenes,polycyclobutadienes and polycyclooctatetraenes; conductive inorganiccompound films, such as titanium nitride, tantalum nitride, indium tinoxide, etc.; and/or doped semiconductors, such as doped silicon, dopedgermanium, doped silicon-germanium, doped gallium arsenide, doped(including auto-doped) zinc oxide, zinc sulfide, etc. In variousembodiments, the metal/alloy for used for the conductive substrate maycomprise a multi-layer structure, such as aluminum, tantalum orzirconium deposited (e.g., by sputtering or CVD) onto a thin coppersheet or foil, or copper deposited (e.g., by electroplating) onto a thinaluminum sheet or foil. Preferably, the conductive substrate/unitarymaterial comprises aluminum.

In various implementations a conductor ink is used in the coating and/orprinting step to form the bottom and top capacitor electrodes. Such aconductor ink may comprise precursors of elemental metals such asaluminum, titanium, vanadium, chromium, molybdenum, tungsten, iron,nickel, palladium, platinum, copper, zinc, silver, gold, etc. Inpreferred embodiments, the metal is Pd. Additionally, or alternatively,the conductor ink may comprise a conventional alloy of such elementalmetals, such as aluminum-copper alloys, aluminum-silicon alloys,aluminum-copper-silicon alloys, titanium-tungsten alloys, Mo—W alloys,aluminum-titanium alloys, etc. In other implementations, electricallyconductive metal compounds, such as the nitrides and silicides ofelemental metals (e.g., titanium nitride, titanium silicide, tantalumnitride, cobalt silicide, molybdenum silicide, tungsten silicide,platinum silicide, etc.) may be used in the conductor ink formulation.In other implementations, the metal/conductor ink comprises one or moremetal precursors selected from the group consisting of metalnanoparticles, organometallic compounds, and metal salts, in a solventin which the metal precursor(s) are soluble.

In preferred embodiments, the metal of the conductor ink is able towithstanding high-temperature processing, such as chromium, molybdenum,tungsten, nickel, palladium, platinum, and conventional metal alloysthereof (e.g., aluminum-copper alloys, aluminum-silicon alloys,aluminum-copper-silicon alloys, aluminum-titanium alloys,titanium-tungsten alloys, Mo—W alloys, etc.). Preferably the metal alloycomprises an electrically conductive metal compounds, such as thenitrides and silicides of elemental metals (e.g., titanium nitride,titanium silicide, tantalum nitride, cobalt silicide molybdenumsilicide, tungsten silicide, tungsten nitride, tungsten silicon nitride,platinum silicide, etc.). Printable silicide-forming precursorformulations, and methods of forming such printable formulations, aredescribed in co-pending U.S. patent application Ser. No. 12/131,002,filed May 30, 2008 (Attorney Docket No. IDR1263), the relevant portionsof which are incorporated herein by reference.

In some implementations, the ink precursor for the (semi)conductivelayers (e.g., bottom and/or top capacitor electrodes) comprisesnanoparticles and/or molecular, oligomeric and/or polymeric compounds ofsilicon, silicide forming metals, refractory metals, or combinationsthereof. Such silicide-forming metals may include Ni, Co, Pd, Pt, Ti, W,and/or Mo, and such refractory metals may include Pd, Mo, and/or W. Thenanoparticles or nanocrystals in the ink formulation may be passivatedor unpassivated, as described in co-pending U.S. application Ser. Nos.11/888,949 and 11/888,942 (Attorney Docket Nos. IDR0742 and IDR0743),filed Aug. 3, 2007 and Aug. 3, 2007, respectively, the relevant portionsof which are incorporated herein by reference.

In some embodiments, the ink formulation may consist essentially of oneor more Group 4, 5, 6, 7, 8, 9, 10, 11, or 12 metal salt(s) and/or metalcomplex(es), one or more solvents adapted to facilitate coating and/orprinting of the formulation. Optionally, the formulation may include oneor more additives that form gaseous or volatile byproducts uponreduction of the metal salt or metal complex to an elemental metal oralloy thereof. In further embodiments, the ink formulation may furtherconsist essentially of (or the additive may comprise) an anion source,adapted to facilitate dissolution of the metal salt or metal complex inthe solvent. In such embodiments, the Group 4, 5, 6, 7, 8, 9, 10, 11, or12 metal salt comprises a palladium, nickel, cobalt, or platinum salt.The solvent(s) may comprise water, an organic solvent, a mixture oforganic solvents, or a mixture of one or more organic solvents andwater. However, in further embodiments, the formulation may besubstantially anhydrous. In such anhydrous formulations, water (to theextent initially present) is removed or minimized, in which case wateris generally not added (although it could be added, if desired, forexample to dilute a concentrated ink after manufacturing and/orshipping, but prior to printing). Such ink formulations and methods offorming the same are described in co-pending U.S. patent applicationSer. No. 12/131,002 (Attorney Docket No. IDR1263), the relevant portionsof which are incorporated herein by reference.

In some embodiments, a printed metal layer (e.g., Pd) can serve as aseed layer for electroless deposition or electroplating of other bulkconductive metals and/or forming a metal silicide if so desired. Inthese embodiments, the ink used to form the seed layer of metal may be ananoparticle- and/or compound-based metal in such as a PdCl₂-containingink. In other embodiments, the seed layer may comprise metalnanoparticles comprising cobalt, nickel, platinum, palladium, titanium,tungsten or molybdenum. However, in preferred embodiments, the seedlayer comprises palladium. The conductive bulk metal in such embodimentsmay comprise Al, Ag, Au, Cu, Pd, Pt, Ni, Cr, Mo, W, Ru, Rh, and alloysand/or mixtures thereof. Metal inks suitable for forming a seed layer,bulk conductive metals, and methods of forming structures from the sameare described in co-pending U.S. application Ser. Nos. 12/131,002 and12/175,450 (Attorney Docket Nos. IDR1263 and IDR1052, respectively),filed on May 30, 2008 and Jul. 17, 2008 respectively, the relevantportions of which are incorporated herein by reference.

In exemplary implementations, the conductor ink comprises asemiconductor. In various embodiments, the semiconductor may be eitherlightly or heavily doped. In the case of silicon or silicon-germanium,the dopant may be selected from the group consisting of boron,phosphorous and arsenic, typically in a conventional concentration(e.g., light or heavy, and/or from 10¹³ to 10¹⁵, 10¹⁵ to 10¹⁷, 10¹⁶ to10¹⁸, 10¹⁷ to 10¹⁹, 10¹⁹ to 10²¹ atoms/cm² or any range of valuestherein). Suitable semiconductor inks comprise a liquid-phase (poly)-and/or (cyclo)silane. Liquid-phase semiconductor inks may furthercomprise a semiconductor nanoparticle (such as passivated Si, Ge, orSiGe nanoparticles) and/or a solvent (e.g., cycloalkane). Thenanoparticles, or nanocrystals, of such formulations may beconventionally passivated with one or more surfactants or surfaceligands such as alkyl, aralkyl, alcohol, alkoxy, mercaptan, alkylthoi,carboxylic acid and/or carboxylate groups). In the alternative, thenanoparticles/nanocrystals may be unpassivated.

In other embodiments, the semiconductor ink may comprise one or moresemiconductor compounds (e.g., a (doped) Group IV compound such as SiGeor SiC, III-B compounds such as GaAs, chalcogenide semiconductors suchas ZnO and ZnS, organic semiconductors, etc.), and/or one or moresemiconductor nanoparticles (e.g., Si, Ge, SiGe, etc.), along with asolvent in which the nanoparticles/compounds are soluble or suspendable(e.g., a C₆-C₂₀ branched or unbranched alkane that may be substitutedwith one or more halogens, a C₆-C₂₀ branched or unbranched alkene, aC₂-C₆ branched or unbranched alkene substituted with one or morehalogens, a C₅-C₂₀ cycloalkane such as cyclohexane, cyclooctane ordecalin, a C₆-C₁₀ aromatic solvent such as toluene, xylene, tetralin, adi-C₁-C₁₀ alkyl ether having a total of at least 4 carbon atoms, and/ora C₄-C₁₀ cyclic alkyl ether such as tetrahydrofuran or dioxane, etc.).The ink formulation may also comprise a surface tension reducing agent,a surfactant, a binder and/or a thickening agent. However, suchadditives or agents may be omitted. Various exemplary ink formulations,and methods for making such ink formulations are described in co-pendingU.S. patent application Ser. Nos. 10/616,147, 10/789,317, 11/452,108,11/888,949, 11/888,942 and 12/131,002, (Attorney Docket Nos. KOV-004,IDR0020, IDR0502, IDR0742, IDR0743, and IDR1263), filed on Jul. 8, 2003,Feb. 27, 2004, Jun. 12, 2006, Aug. 3, 2007, Aug. 3, 2007, and May 30,2008, respectively, the relevant portions of which are incorporatedherein by reference.

In the present surveillance and/or identification device the bottomcapacitor electrode may have a nominal thickness of from 5 to 200 μm(preferably from 20 to 100 μm) and/or a resistivity of 0.1-10 μohm-cm(preferably from 0.5 to 5 μohm-cm, and in one embodiment, about 3μohm-cm). While the bottom capacitor is located substantially in thecenter of the device electrode (see, e.g., 104 of FIGS. 6A and 210 ofFIG. 7A), it may be located in any area of the device, in accordancewith design choices and/or preferences. Also, the bottom capacitorelectrode (e.g., 104 and/or 210) may have any desired shape, such asround, square, rectangular, triangular, etc., and with nearly anydimensions that allow it to fit in and/or on thesurveillance/identification device. Preferably, the bottom capacitorelectrode (e.g., 104 and/or 210) has dimensions of (i) width, length andthickness, or (ii) radius and thickness, in which the thickness issubstantially less than the other dimension(s). For example, the bottomcapacitor electrode (104 and/or 210) may have a radius of from 25 to10,000 μm (preferably 50 to 5,000 μm, 100 to 2,500 μm, or any range ofvalues therein), or a width and/or length of 50 to 20,000 μm, 100 to10,000 μm, 250 to 5,000 μm, or any range of values therein.

In some embodiments, the top capacitor electrode 120 may be formeddirectly above the first dielectric layer 112, such that the topcapacitor electrode 120 completely covers the dielectric layer 112, asshown in FIG. 6A. In alternative embodiments, the top capacitorelectrode 230 may be formed such that it does not completely cover thefirst dielectric layer 220, and thus one or more portions of the firstdielectric layer 220 are exposed (see, e.g., FIGS. 9A-9B).

As with the bottom capacitor electrode, the top capacitor electrode mayalso have any desired shape, such as round, square, rectangular,triangular, etc., and with nearly any dimensions that allow it to fit inand/or on the surveillance/identification device. In preferredembodiments, the top capacitor electrode 120 has a dome-shaped profile.In exemplary embodiments, the top capacitor electrode (e.g., 120 and/or230) has dimensions of (i) width, length and thickness, or (ii) radiusand thickness, in which the thickness is substantially less than theother dimension(s). For example, top capacitor electrode 120 and/or 230may have a radius of from 20 to 10,000 μm (preferably 40 to 5,000 μm, 80to 2,500 μm, or any range of values therein), or a width and/or lengthof 40 to 20,000 μm, 80 to 10,000 μm, 150 to 5,000 μm, or any range ofvalues therein.

The Inductor and/or Antenna

As with the substrate, some of the various characteristics of theinductor and/or antenna depend largely on which of the above-describedmethods will be used to make the device However, in general, the antennaand/or inductor comprises a metal. The metal may be one commerciallyavailable (e.g., a foil comprising aluminum, stainless steel, cooper, orany alloy thereof). In embodiments where the inductor/antenna is formedfrom the conductive substrate/unitary conductive material, the inductorcomprises the same material as the substrate and/or the bottom capacitorplate. However, the inductor/antenna may generally comprise any of themetals described herein. In alternate embodiments, the inductor/antennamay be printed on the top of the structure (e.g., in a similar fashionas the electrically conductive feature of the first general method).

The inductor/antenna may further comprise one or morecontact/interconnect pad regions (see, e.g., 102 of FIGS. 6A and 6Band/or 312/314 of FIG. 11) for connecting the inductor to the capacitorelectrodes. The inductor may comprise a continuous structure or it maybe discontinuous and comprise a first (outer) inductor coupled to onecapacitor electrode and a second (inner) inductor coupled to a secondcapacitor electrode. In various embodiments, a backing and/or supportlayer may be attached to the inductor. The support and/or backing layermay provide an adhesive surface for attachment to or placement of thesurveillance/identification device to an article to be tracked ormonitored.

In some implementations (see, e.g., the embodiments according to FIG.11), the inductor may comprise the antenna, the inductor, or both. Insuch embodiments, a first or outer contact pad (e.g., 312 of FIG. 11) ofthe inductor/antenna electrically contacts the top capacitor electrode230 where it is exposed by the contact hole 235 formed in the seconddielectric layer. Furthermore, a second or inner contact pad (e.g., 314of FIG. 11) electrically contacts the first (semi)conductivelayer/bottom capacitor electrode 210 where it is exposed by the contacthole 215 in the second dielectric layer. In exemplary embodiments, thecontact pads 312 and 314 comprise a metal bump or anisotropic conductivepaste (ACP). The contact pads of the inductor (e.g., 312 and 314) may beattached and/or affixed to the capacitor electrodes (e.g., 235 and 215)by an adhesive, which may be either conductive or non-conductive.

In exemplary embodiments, the inductor/antenna comprises a coil having aplurality of loops or rings. The inductors shown in FIGS. 6B and 11 havethree loops, rings, or coils. However, any suitable number of loops,rings, or coils may be employed, depending on application requirementsand design choices/preferences. The inductor may take any form and/orshape conventionally used for such inductors, but preferably it has acoil, or concentric spiral loop, form. For ease of manufacturing and/ordevice area efficiency, the coil loops generally have a square orrectangular shape, but they may also have a rectangular, octagonal,circular, rounded or oval shape, some other polygonal shape, or anycombination thereof, and/or they may have one or more truncated corners,according to application and/or design choices and/or preferences, aslong as each successive loop is substantially entirely positionedbetween the preceding loop and the outermost periphery of thetag/device.

Referring to FIGS. 6A-6B and 11, the concentric loops or rings of theinductor coil (e.g., 106 a-106 e and/or 310) may have any suitable widthand pitch (i.e., inter-ring spacing), and the width and/or pitch mayvary from loop to loop or ring to ring. However, in certain embodiments,the wire in each loop (or in each side of each loop or ring) mayindependently have a width of from 2 to 1000 μm (preferably from 5 to500 μm, 10 to 200 μm, or any range of values therein) and length of 100to 50,000 μm, 250 to 25,000 μm, 500 to 20,000 μm, or any range of valuestherein (as long as the length of the inductor wire does not exceed thedimensions of the EAS device). Alternatively, the radius of each wireloop or ring in the inductor may be from 250 to 25,000 μm (preferably500 to 20,000 μm). Similarly, the pitch between wires in adjacentconcentric loops or rings of the inductor may be from 2 to 1000 μm, 3 to500 μm, 5 to 250 μm, 10 to 200 μm, or any range of values therein.Furthermore, the width-to-pitch ratio may be from a lower limit of about1:10, 1:5, 1:3, 1:2 or 1:1, up to an upper limit of about 1:2, 1:1, 2:1,4:1 or 6:1, or any range of endpoints therein.

Similarly, interconnect pad(s) (e.g., 102 of FIGS. 6A-6B and/or 312/314of FIG. 11), which is generally configured to provide electricalcommunication and/or physical contact with bottom and/or top capacitorelectrodes (see, e.g., 312/314 of FIG. 11), or in alternate embodimentswith the electrically conducting feature (see, e.g., 102 of FIGS.6A-6B), may have any desired shape, such a round, square, rectangular,triangular, etc. Furthermore, the interconnect/contact pad may havenearly any dimensions that allow it to fit in and/or on thesurveillance/identification tag or device, and provide electricalcommunication and/or physical contact with the capacitor electrodesand/or the electrically conducting feature. Preferably, the interconnectpad(s) (e.g., 102 of FIGS. 6A-6B and 312, 314 of FIG. 11) havedimensions of (i) width, length and thickness, or (ii) radius andthickness, in which the thickness is substantially smaller than theother dimension(s). For example, the interconnect pad may have a radiusof from 25 to 2000 μm (preferably 50 to 1000 μm, 100 to 500 μm, or anyrange of values therein), or a width and/or length of 50 to 5000 μm, 100to 2000 μm, 200 to 1000 μm, or any range of values therein.

The First and Second Dielectric Layers

The first dielectric layer (e.g., 112 of FIG. 6A and/or 220 of FIG. 10)preferably is designed and made such that application of a deactivatingradio frequency electromagnetic field induces a voltage differential inthe capacitor across the dielectric layer that will deactivate thetag/device (e.g., a voltage differential of about 4 to about 50 V,preferably about 5 to less than 30 V, more preferably about 10 to 20 V,or any desired range of endpoints therein) through breakdown of thedielectric layer to shorted state or changed capacitance such that thetag circuit no longer resonates at the desired frequency. Thus, incertain embodiments, the first dielectric layer has (i) a thickness offrom 50 to 400 Å and/or (ii) a breakdown voltage of from about 10 toabout 20V.

The first and/or second dielectric layer(s) may comprise anyelectrically insulative dielectric material, such as oxide and/ornitride ceramics or glasses (e.g., silicon dioxide, silicon nitride,silicon oxynitride, aluminum oxide, tantalum oxide, zirconium oxide,etc.), polymers such as polysiloxanes, parylene, polyethylene,polypropylene, undoped polyimides, polycarbonates, polyamides,polyethers, copolymers thereof, fluorinated derivatives thereof, etc. Inpreferred embodiments, the first dielectric layer (e.g., capacitordielectric layer) comprises or consists essentially of aluminum oxideand/or a corresponding oxide of the metal used for the bottom capacitorelectrode (e.g., 104 of FIG. 6A and/or 210 of FIG. 10).

In some embodiments, the first and/or second dielectric layer may be aninorganic insulator. For example, the dielectric may comprise a metaloxide and/or nitride of the formula M_(x)O_(y)N_(z), wherein M issilicon or a metal selected from the group consisting of aluminum,titanium, zirconium, tantalum, hafnium, vanadium, chromium, molybdenum,tungsten, rhodium, rhenium, iron, ruthenium, copper, zinc, indium, tin,lanthanide metals, actinide, metals, and mixtures thereof. In furtherembodiments, the inorganic insulator may comprise silicates, aluminates,and/or aluminosilicates of such metals and mixtures, where y/2+z/3equals the combined oxidation state of the x instances of M. Inexemplary embodiments, the dielectric comprises a corresponding oxide ofthe metal used in the conductive substrate and/or the metal of the(semi)conductive layer (e.g., top capacitor electrode).

The second dielectric layer (e.g., 130 of FIG. 3A and/or 240 of FIG. 10)on the top capacitor electrode (e.g., 120 of FIG. 3A and/or 230 of FIG.10) may have one or more contact holes therein (see, e.g., 135 of FIG.3A and/or 235 and 215 of FIG. 10). Referring to FIG. 3A, contact hole130 is formed in the second dielectric layer 130 to expose a portion ofthe top capacitor electrode 120. This provides electrical contactbetween the top capacitor electrode 120 and the inductor/antenna via theelectrically conducting feature (e.g., 140 of FIG. 4A). Referring now toFIGS. 10-11, a first contact hole 215 is formed in the second dielectriclayer 240 to expose the first (semi)conductive layer 210 (e.g., thebottom capacitor electrode), and provide electrical contact with theinductor at interconnect pad 314. A second contact hole 235 is alsoformed in the second dielectric layer 240 to expose the top capacitorelectrode 230, and provide electric contact with the inductor atinterconnect pad 312.

The second dielectric layer may be formed from a liquid-phase dielectricprecursor ink. The liquid-phase dielectric precursor ink may comprise acompound of the formula A_(n)H_(y), where n is from 3 to 12, each A isindependently Si or Ge, and y is an even integer of from n to 2n+2, andpreferably a compound of the formula (AH_(z))_(n), where n is from 5 to10, each A is independently Si or Ge, and each of the n instances of zis independently 1 or 2. A corresponding silicon and/or germanium oxidefilm may be formed by curing the precursor film as previously described(e.g., Group IVA element precursor film).

In exemplary embodiments, the second dielectric layer may comprise spinon glasses (which may be photodefinable or non-photodefinable, in thelatter case patterned by direct printing or post depositionlithography); polyimides (which may be photodefinable and/or thermallysensitized for thermal laser patterning, or non-photodefinable forpatterning by direct printing or post deposition lithography); BCB orother organic dielectrics such as SiLK® dielectric material (SILK is aregistered trademark of Dow Chemical Co., Midland, Mich.); low-kinterlayer dielectrics formed by sol-gel techniques; plasma enhanced(PE) TEOS (i.e., SiO₂ formed by plasma-enhanced CVD oftetraethylorthosilicate); and laminated polymer films such aspolyethylene (PE), polyester, or higher temperature polymers such asPES, polyimide or others that are compatible with subsequent hightemperature processing.

In preferred embodiments, the second dielectric layer comprises an oxideand/or nitride of a Group IVA element, which may further containconventional boron and/or phosphorous oxide modifiers in conventionalamounts. Thus, the Group IVA element may comprise or consist essentiallyof silicon, in which case the second dielectric layer (e.g., 130 in FIG.3A and/or 240 in FIG. 10) may comprise or consist essentially of silicondioxide, silicon nitride, silicon oxynitride, a borosilicate glass, aphosphosilicate glass, or a borophosphosilicate glass (preferablysilicon dioxide). The second dielectric layer may have a thickness of atleast 1 μm, preferably from 2 to 25 μm, more preferably from 5 to 10 μm.

The Electrically Conducting Feature

The first exemplary device (see, e.g., FIGS. 1A-6B) comprises anelectrically conducting feature 140 to provide electrical communicationbetween the capacitor (e.g., top capacitor electrode) 120 and theinductor 106 a-106 e. The feature may be connected to the capacitorelectrodes and the inductor using either conductive or non-conductiveadhesive. The feature may have one or more interconnect/contact pads(e.g., a pad portion) for connecting to the capacitor electrode 120and/or the inductor coils 106 a-106 e/contact pad 102. The feature mayhave any suitable shape (e.g., square, rectangular, round, etc.). Invarious embodiments, the feature has a thickness of from 30 nm to 5000nm, preferably from 50 nm to 2000 nm, more preferably from 80 nm to 500nm.

The feature may comprise any electrically conductive material. However,in exemplary embodiments, the feature 140 comprises a second metal,which may be selected from the same materials and/or metals describedabove for the first (semi)conductive layer (e.g., bottom capacitorelectrode) and/or the inductor as discussed herein. For example, inpreferred embodiments, the feature comprises aluminum, titanium, copper,silver, chromium, molybdenum, tungsten, nickel, gold, palladium,platinum, zinc, iron, stainless steel, or any alloy thereof. Inexemplary embodiments, the feature consists essentially of silver, gold,copper or aluminum (or a conductive alloy thereof). In variousimplementations the feature and the capacitor electrodes comprise thesame material. However, the invention is not limited as such. Thus, inan alternate embodiment, the feature and the capacitor electrodescomprise different materials. In some implementations, dopants,siliciding components, or other work function modulation agents and/ortunneling barrier materials may be included in the feature 140. Suchinclusion may reduce the series resistance and increase the Q, andoverall performance of the surveillance and/or identification device.

Passivation Layer

In some embodiments, the present device may further comprise apassivation layer (see, e.g., structure 150 of FIG. 6A) over thestructure, including but not limited to the electrically conductingfeature 140, and the top capacitor electrode 120. The passivation layermay inhibit or prevent the ingress of water, oxygen, and/or otherspecies that might cause degradation or failure of the integratedcircuitry/device. Furthermore the passivation layer may provide somemechanical support to the device, particularly during subsequentprocessing steps. The passivation layer is generally conventional, andmay comprise an organic polymer, such as parylene, polyethylene,polypropylene, a polyimide, copolymers thereof, a fluorinated organicpolymer, or any other barrier material. In other embodiments, thepassivation layer may comprise an inorganic dielectric, such as aluminumoxide, silicon dioxide (e.g., which may be conventionally doped and/orwhich may comprise a spin-on-glass, silicon nitride, silicon oxynitride,polysiloxane, or a combination thereof, as a mixture or a multilayerstructure).

In the alternative, the passivation layer may further comprise anunderlying dielectric layer, which may comprise a material having lowerstress than the overlying passivation layer. For example, the dielectriclayer may comprise an oxide, such as SiO₂ (e.g., TEOS, USG, FSG, BPSG,etc.), and the passivation layer may comprise silicon nitride or asilicon oxynitride. In such embodiments, the passivation layer may havea thickness slightly greater than that of the underlying dielectriclayer.

In exemplary embodiments, the passivation layer generally has the samewidth and length dimensions as the surveillance/identification device.It may also have any thickness suitable for such asurveillance/identification tag or device. For example, the passivationlayer 150 may have a thickness of from 3 to 100 μm, from 5 to 50 μm, 10to 25 μm, or any range of values therein.

The present device may also further comprise a support and/or backinglayer (not shown) on a surface of the inductor (see, e.g., 106 a-106 eof FIG. 6B and/or 310 of FIG. 11). The support and/or backing layer areconventional, and are well known in the surveillance/identificationdevice arts (see, e.g., U.S. Pat. Appl. Publication No. 2002/0163434 andU.S. Pat. Nos. 5,841,350, 5,608,379 and 4,063,229, the relevant portionsof each of which are incorporated herein by reference). Generally, suchsupport and/or backing layers provide (1) an adhesive surface forsubsequent attachment or placement onto an article to be tracked ormonitored, and/or (2) some mechanical support for thesurveillance/identification device itself. For example, the presenttag/device may be affixed to the back of a price or articleidentification label, and an adhesive coated or placed on the oppositesurface of the tag (optionally covered by a conventional release sheetuntil the tag is ready for use), to form a price or articleidentification label suitable for use in a conventionalsurveillance/identification tag/device system.

Exemplary Methods of Detecting Items Using the Present Surveillanceand/or Identification Tags/Devices

The present invention further relates to method of detecting an item orobject in a detection zone comprising the steps of: (a) causing orinducing a current in the present device sufficient for the device toradiate detectable electromagnetic radiation (preferably at a frequencythat is an integer multiple or an integer divisor of an appliedelectromagnetic field), (b) detecting the detectable electromagneticradiation, and optionally, (c) selectively deactivating the deviceand/or causing the device to take action. Generally, currents andvoltages are induced in the present device sufficient for the device toradiate detectable electromagnetic radiation when the device is in adetection zone comprising an oscillating electromagnetic field. Thisoscillating electromagnetic field is produced or generated byconventional surveillance/identification detection equipment and/orsystems.

The present method of use may further comprise attaching, affixing orotherwise including the present device on or in an object or article tobe detected. Furthermore, in accordance with an advantage of the presentdevice, it may be deactivated by non-volatile shifting of the thresholds(i.e., position of the CV curve features versus voltage) or capacitanceof the device in response to an applied electromagnetic field havingsufficient strength and an effective oscillating frequency to induce acurrent, voltage and/or resonance in the device. Typically, the deviceis deactivated when the presence of the object or article in thedetection zone is not to be detected or otherwise known.

The use of electronic article surveillance, security and/oridentification systems for detecting and/or preventing theft orunauthorized removal of articles or goods from retail establishmentsand/or other facilities, such as libraries, has become widespread. Ingeneral, surveillance/identification device systems employ a label orsecurity tag, also known as an EAS, RF, and/or RFID tag, which isaffixed to, associated with, or otherwise secured to an article or itemto be detected (e.g., protected) or its packaging.Surveillance/identification tags may have many different sizes, shapesand forms, depending on the particular type of system in use, the typeand size of the article, etc. In general, such systems are employed fordetecting the presence or absence of an active security tag as thesecurity tag and the protected article to which it is affixed passthrough a security or surveillance zone or pass by or near a securitycheckpoint or surveillance station. However, the present invention isnot limited to security. For example, the presentsurveillance/identification devices may further comprise logic, whichcauses the device to perform an action upon detection in the detectionzone.

The present tags are designed at least in part to work with electronicsecurity systems that sense disturbances in radio frequency (RF)electromagnetic fields. Such electronic security systems generallyestablish an electromagnetic field in a controlled area defined byportals through which articles must pass in leaving the controlledpremises (e.g., a retail store). A tag/device having a resonant circuitis attached to each article, and the presence of the tag circuit in thecontrolled area is sensed by a receiving system to denote theunauthorized removal of an article. The tag circuit may deactivated,detuned or removed by authorized personnel from any article authorizedto leave the premises to permit passage of the article through thecontrolled area equipped with alarm activation. Most of the tags thatoperate on this principle are single-use or disposable tags, and aretherefore designed to be produced at low cost in very large volumes.

The present tags may be used (and, if desired and/or applicable,re-used) in any commercial EAS, RF, and/or RFID application and inessentially any frequency range for such applications. For example, thepresent tags may be used at the frequencies, and in the fields and/orranges, described in the Table below:

TABLE 1 Exemplary applications. Preferred Range/Field Range/Field ofPreferred of Detection/ Detection/ Exemplary Commercial FrequenciesFrequencies Response Response Application(s) 100-150 KHz 125-134 KHz upto 10 feet up to 5 feet animal ID, car anti-theft systems, beer kegtracking about 8.2 MHz 8.2 MHz up to 10 feet up to 5 feet inventorytracking (e.g., libraries, apparel, auto/ motorcycle parts), buildingsecurity/access about 13.56 MHz 13.56 MHz up to 10 feet up to 5 feetinventory tracking (e.g., libraries, apparel, auto/ motorcycle parts),building security/access 800-1000 MHz 868-928 MHz up to 30 feet up to 18feet pallet and shipping container tracking, shipyard container tracking2.4-2.5 GHz about 2.45 GHz up to 30 feet up to 20 feet auto toll tags

Deactivation methods generally incorporate remote electronicdeactivation of a resonant tag circuit such that the deactivated tag canremain on an article properly leaving the premises. Examples of suchdeactivation systems are described in U.S. Pat. Nos. 4,728,938 and5,081,445, the relevant portions of each of which are incorporatedherein by reference. Electronic deactivation of a resonantsecurity/identification tag involves changing or destroying thedetection frequency resonance so that the security tag is no longerdetected as an active security tag by the security system. There aremany methods available for achieving electronic deactivation. Ingeneral, however, the known methods involve either short circuiting aportion of the resonant circuit or creating an open circuit within someportion of the resonant circuit to either spoil the Q of the circuit orshift the resonant frequency out of the frequency range of the detectionsystem, or both.

At energy levels that are typically higher than the detecting signal,but generally within FCC regulations, the deactivation apparatus inducesa voltage in the resonant circuit of the tag 100 sufficient to cause thedielectric film 20 between the lower capacitor plate 10 a andsemiconductor component 30 to break down. Thus, the presentsurveillance/identification device(s) described herein can beconveniently deactivated at a checkout counter or other similar locationby momentarily placing the tag above or near the deactivation apparatus.

The present invention thus also pertains to article surveillancetechniques wherein electromagnetic waves are transmitted into an area ofthe premises being protected at a fundamental frequency (e.g., 13.56MHz), and the unauthorized presence of articles in the area is sensed byreception and detection of electromagnetic radiation emitted by thepresent surveillance/identification device(s). This emittedelectromagnetic radiation may comprise second harmonic or subsequentharmonic frequency waves reradiated from sensor-emitter elements,labels, or films comprising the present EAS device that have beenattached to or embedded in the articles, under circumstances in whichthe labels or films have not been deactivated for authorized removalfrom the premises.

A method of article surveillance, theft detection, or other methods ofidentification according to aspects of the present invention may beunderstood with the following description of the sequential stepsutilized. The present surveillance/identification tag (for example,formed integrally with a price label) is attached to or embedded in anitem, article or object that may be under system surveillance. Next, anyactive tags/devices on articles that have been paid for or otherwiseauthorized for removal from the surveillance area may be deactivated ordesensitized by a deactivation apparatus operator (e.g., a checkoutclerk or guard) monitoring the premises. Thereafter, harmonic frequencyemissions or re-radiation signals or electromagnetic waves or energyfrom devices/tags that have not been deactivated or desensitized aredetected as they are moved through a detection zone (e.g., an exit orverification area) in which a fundamental frequency electromagnetic waveor electrical space energy field is present. The detection of harmonicsignals in this area signifies the unauthorized presence or attemptedremoval of unverified articles with active devices/tags thereon, and maybe used to signal or trigger an alarm or to lock exit doors orturnstiles. While the detection of tag signals at a frequency of 2× or ½the carrier or reader transmit frequency represents a preferred form ofthe method of use, other harmonic signals, such as third and subsequentharmonic signals, as well as fundamental and other subharmonic signals,may be employed.

CONCLUSION/SUMMARY

Thus, the present invention provides methods of making a capacitor,surveillance and/or identification devices, and methods for themanufacture and use of such devices. A first general method of making acapacitor according to the methods of the present invention comprises(a) forming a first dielectric layer on a conductive substrate, (b)printing a (semi)conductive layer on at least a portion of the firstdielectric, (c) etching the dielectric layer using the (semi)conductivelayer as a mask, (d) forming a second dielectric layer in a pattern onthe conductive substrate and/or the (semi)conductive layer, (e) formingan electrically conducting feature on the second dielectric layer, oneportion of the electrically conducting feature contacting the(semi)conductive layer and a second portion of the conducting featurecontacting the conductive substrate, and (f) forming a bottom electrodefrom the conductive substrate. A surveillance and/or an identificationdevice may be subsequently formed by also forming an inductor from theconductive substrate.

A second general method of making a capacitor comprises (a) printing afirst (semi)conductive layer including a bottom capacitor electrode on asubstrate, (b) forming a first dielectric layer in a pattern on thefirst (semi)conductive layer, (c) printing an upper capacitor plate onthe first dielectric layer, and (d) forming a second dielectric layer onthe substrate, the second dielectric layer having a first contact holetherein exposing the first (semi)conductive layer and a second contacthole exposing the upper capacitor plate. A surveillance and/oridentification device may be formed from the capacitor by couplingand/or otherwise connecting an antenna and/or inductor to the first(semi)conductive layer and the upper capacitor plate.

A first surveillance and/or identification device of the presentinvention generally comprises (a) a unitary conductive structurecomprising a bottom capacitor electrode and an inductor, (b) a firstdielectric layer on the bottom capacitor electrode and inductor, (c) atop capacitor electrode having a dome-shaped profile on the firstdielectric layer, (d) a second dielectric layer on the top capacitorelectrode, and the conductive structure, and (e) an electricallyconducting feature on the second dielectric layer, one portion of theelectrically conducting feature contacting the top capacitor electrodeand a second portion of the conducting feature contacting the conductivematerial.

A second surveillance and/or identification device of the presentinvention generally comprises (a) a bottom capacitor electrode having adome-shaped profile on a substrate, (b) a first dielectric layer on thebottom capacitor layer, (c) a top capacitor electrode having adome-shaped profile on the first dielectric layer, (d) a seconddielectric layer on the substrate having first and second contact holestherein exposing the bottom capacitor electrode and the top capacitorelectrode, and (e) an antenna and/or inductor having a first end coupledand/or connected to the bottom capacitor electrode, and a second endcoupled and/or connected to the top capacitor electrode.

The method for detecting items with a surveillance and/or identificationdevice of the present invention generally comprises the steps of (1)causing or inducing a current sufficient for the device to re-radiateand/or backscatter detectable electromagnetic radiation, and (2)detecting the detectable electromagnetic radiation. Optionally, adetected surveillance and/or identification device may be selectivelydeactivated. Additionally or alternatively, the method may includecausing a device to take an action when the electromagnetic radiation isdetected.

The methods and/or devices of the present invention may improvesurveillance/identification device reliability by (1) improvingmanufacturing tolerances, (2) ensuring more reliable dielectric rupturefor tag deactivation, and (3) substantially reducing accidental healingor repair of the dielectric after deactivation, thus preventingunintended reactivation of the surveillance/identification device.

The foregoing descriptions of specific embodiments of the presentinvention have been presented for purposes of illustration anddescription. They are not intended to be exhaustive or to limit theinvention to the precise forms disclosed, and obviously manymodifications and variations are possible in light of the aboveteaching. The embodiments were chosen and described in order to bestexplain the principles of the invention and its practical application,to thereby enable others skilled in the art to best utilize theinvention and various embodiments with various modifications as aresuited to the particular use contemplated. It is intended that the scopeof the invention be defined by the Claims appended hereto and theirequivalents.

1. A surveillance and/or identification device comprising: a) a unitaryconductive structure comprising a bottom capacitor electrode and aninductor; b) a first dielectric layer on the bottom capacitor electrodeand inductor; c) a top capacitor electrode on the first dielectriclayer, the top capacitor having a dome-shaped profile; d) a seconddielectric layer on the top capacitor electrode and the conductivestructure; and e) an electrically conducting feature on the seconddielectric layer, one portion of the electrically conducting featurecontacting the top capacitor electrode and a second portion of theconducting feature contacting the conductive structure.
 2. The device ofclaim 1, wherein the unitary conductive structure comprises a metalfilm, metal foil, or metal sheet.
 3. The device of claim 2, wherein themetal substrate comprises aluminum, titanium, copper, silver, chromium,molybdenum, tungsten, nickel, gold, palladium, platinum, zinc, iron,stainless steel, or an alloy thereof.
 4. The device of claim 1, whereinthe unitary conductive structure consists essentially of aluminum. 5.The device of claim 1, wherein the capacitor electrodes comprisealuminum, titanium, copper, silver, chromium, molybdenum, tungsten,nickel, gold palladium, platinum, zinc, stainless steel, or an alloythereof.
 6. The device of claim 1, wherein the bottom capacitorelectrode comprises a multi-layer structure.
 7. The device of claim 1,wherein at least one of the capacitor electrodes comprises asemiconductor material.
 8. The device of claim 7, wherein at least oneof the capacitor electrodes comprises a doped Group IVA element.
 9. Thedevice of claim 1, wherein the inductor and/or antenna further comprisesone or more interconnect pads.
 10. The device of claim 1, wherein theinductor comprises a coil having a plurality of loops or rings.
 11. Thedevice of claim 1, wherein the first dielectric layer has a thickness offrom 50 to 400 Å and a breakdown voltage of from about 10 to about 20 V.12. The device of claim 1, wherein the first dielectric layer comprisesaluminum oxide.
 13. The device of claim 1, wherein the first dielectriclayer comprises a corresponding oxide of the bottom capacitor electrodemetal.
 14. The device of claim 1, wherein the second dielectric layercomprises an oxide and/or nitride of a Group IVA element.
 15. The deviceof claim 14, wherein the oxide of a Group IVA element further comprisesboron and/or phosphorous.
 16. The device of claim 1, wherein theelectrically conducting feature comprises one or more interconnect pads.17. The device of claim 1, wherein the electrically conducting featurecomprises aluminum, titanium, copper, silver, chromium, molybdenum,tungsten, nickel, gold, palladium, platinum, zinc, iron, stainlesssteel, or an alloy thereof.
 18. The device of claim 1, wherein theelectrically conducting feature consists essentially of silver, gold,copper, or aluminum.
 19. The device of claim 1, wherein the electricallyconducting feature and the capacitor electrodes comprise a samematerial.
 20. The device of claim 1, further comprising a passivationlayer.
 21. The device of claim 1, further comprising a support and/orbacking layer on a surface of the inductor.
 22. A surveillance and/oridentification device comprising: a) a bottom capacitor electrode on asubstrate, the bottom capacitor electrode having a dome-shaped profile;b) a first dielectric layer on the bottom capacitor electrode; c) a topcapacitor electrode on the first dielectric layer, the top capacitorelectrode having a dome-shaped profile; d) a second dielectric layer onthe substrate, the second dielectric layer having first and secondcontact holes therein exposing the bottom capacitor layer and the uppercapacitor layer; and e) an antenna and/or inductor having a first endcoupled and/or connected to the bottom capacitor electrode and a secondend coupled and/or connected to the top capacitor electrode.
 23. Thedevice of claim 22, wherein the substrate comprises a plate, disc,and/or sheet of a glass, ceramic, dielectric, and/or plastic.
 24. Thedevice of claim 23, wherein the substrate comprises glass or plastic anda planarization layer thereon.
 25. The device of claim 22, wherein thecapacitor electrodes comprise aluminum, titanium, copper, silver,chromium, molybdenum, tungsten, nickel, gold, palladium, platinum, zinc,iron, stainless steel, or an alloy thereof.
 26. The device of claim 22,wherein at least one of the capacitor electrodes comprises asemiconductor material.
 27. The device of claim 26, wherein at least oneof the capacitor electrodes comprises a doped Group IVA element.
 28. Thedevice of claim 22, wherein the first dielectric layer has a thicknessof from 50 to 400 Å and a breakdown voltage of from 10 to 20 V.
 29. Thedevice of claim 22, wherein the first dielectric layer comprisesaluminum oxide.
 30. The device of claim 22, wherein the first dielectriclayer comprises a corresponding oxide of the bottom capacitor electrodemetal.
 31. The device of claim 22, wherein the second dielectric layercomprises an oxide and/or nitride of a Group IVA element.
 32. The deviceof claim 31, wherein the oxide of the Group IVA element furthercomprises boron and/or phosphorous.
 33. The device of claim 22, whereinthe inductor and/or antenna further comprises one or more interconnectpads.
 34. The device of claim 33, wherein the one or more interconnectpads further comprises a metal bump or anisotropic conductive paste. 35.The device of claim 33, further comprising a conductive adhesive bondingthe one or more interconnect pads to the capacitor electrodes.
 36. Thedevice of claim 22, further comprising a backing and/or support layerattached to the inductor.
 37. A method of detecting items with asurveillance and/or identification device, comprising the steps of: a)causing or inducing a current sufficient for the device of claim 1 toradiate detectable electromagnetic radiation; b) detecting thedetectable electromagnetic radiation; and c) optionally, selectivelydeactivating the device.
 38. The method of claim 37, wherein thedetectable electromagnetic radiation has a frequency that is an integermultiple or an integer divisor of a fundamental frequency of anoscillating electromagnetic field or wave applied to the device.
 39. Themethod of claim 37, further comprising attaching, affixing or includingthe device on or in the item.
 40. A method of detecting items with asurveillance and/or identification device, comprising the steps of: a)causing or inducing a current sufficient for the device of claim 22 toradiate detectable electromagnetic radiation; b) detecting thedetectable electromagnetic radiation; and c) optionally, selectivelydeactivating the device.
 41. The method of claim 40, wherein thedetectable electromagnetic radiation has a frequency that is an integermultiple or an integer divisor of a fundamental frequency of anoscillating electromagnetic field or wave applied to the device.
 42. Themethod of claim 40, further comprising attaching, affixing or includingthe device on or in the item.